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Correction, that should have been WEINER not WIENER!
Malcolm "Dick" wrote in message ... I'm trying to get a hold of a tool that will undo grub screws securing the front panel knobs on my venerable BC221, can anyone suggest where I can get a hold of one, a modern equivalent and/or something that can be modified to do the job ?? Although all BC221s were provided with the tool (stored in a clip beside the spare valves) I've never seen one and can only guess that it must be something like a very small Phillips screwdriver head but with a parallel rather than tapered tip. It must also be less than 3/32" dia 'cos I've just tried to make one by hand out of 3/32" dia steel rod and that was too big, don't think my eyesight is up to hand filing the cruciform tip in any smaller dia rod, hence a request for help !! My BC221 is still furkling along after 63+ years (& only c/s - There, I've said it !!) out of calibration) but I think I should at least try & smarten up the case with a good clean and a bit of fresh paint. Who knows, it's probably got more chance of making the century than I have. Thanks -- Dick GM0MNL |
Correction, that should have been WEINER not WIENER!
Malcolm "Dick" wrote in message ... I'm trying to get a hold of a tool that will undo grub screws securing the front panel knobs on my venerable BC221, can anyone suggest where I can get a hold of one, a modern equivalent and/or something that can be modified to do the job ?? Although all BC221s were provided with the tool (stored in a clip beside the spare valves) I've never seen one and can only guess that it must be something like a very small Phillips screwdriver head but with a parallel rather than tapered tip. It must also be less than 3/32" dia 'cos I've just tried to make one by hand out of 3/32" dia steel rod and that was too big, don't think my eyesight is up to hand filing the cruciform tip in any smaller dia rod, hence a request for help !! My BC221 is still furkling along after 63+ years (& only c/s - There, I've said it !!) out of calibration) but I think I should at least try & smarten up the case with a good clean and a bit of fresh paint. Who knows, it's probably got more chance of making the century than I have. Thanks -- Dick GM0MNL |
You are correct Bob, according to the SCR-221 technical manual
(TM-11-300) there should be two Bristol wrenches (#6 & #8) in the spares kit. I have just tried the one I have on an old wreck of a BC221-T and it fits but don't know whether it is a #6 or a #8. It is just under a 1/10" across the flutes. I believe that during WWII there was a specially employed lady, complete with tattoos presumably, whose task it was to tighten the set-screws on all military equipment. She did such a good job that nobody except a certain candidate for the governorship of California has since been able to move them. I have seen the wrenches on e-bay from time to time. To remove the screws after ordering a bowflex machine and working out with it for 6 months, heat them and the "glue" will release and you will be able to turn them. |
You are correct Bob, according to the SCR-221 technical manual
(TM-11-300) there should be two Bristol wrenches (#6 & #8) in the spares kit. I have just tried the one I have on an old wreck of a BC221-T and it fits but don't know whether it is a #6 or a #8. It is just under a 1/10" across the flutes. I believe that during WWII there was a specially employed lady, complete with tattoos presumably, whose task it was to tighten the set-screws on all military equipment. She did such a good job that nobody except a certain candidate for the governorship of California has since been able to move them. I have seen the wrenches on e-bay from time to time. To remove the screws after ordering a bowflex machine and working out with it for 6 months, heat them and the "glue" will release and you will be able to turn them. |
Mike W wrote:
On Mon, 18 Aug 2003 17:00:04 +0100, Dick wrote: I'm trying to get a hold of a tool that will undo grub screws securing the front panel knobs on my venerable BC221, can anyone suggest where I can get a hold of one, a modern equivalent and/or something that can be modified to do the job ?? Although all BC221s were provided with the tool (stored in a clip beside the spare valves) I've never seen one and can only guess that it must be something like a very small Phillips screwdriver head but with a parallel rather than tapered tip. It must also be less than 3/32" dia 'cos I've just tried to make one by hand out of 3/32" dia steel rod and that was too big, don't think my eyesight is up to hand filing the cruciform tip in any smaller dia rod, hence a request for help !! My BC221 is still furkling along after 63+ years (& only c/s - There, I've said it !!) out of calibration) but I think I should at least try & smarten up the case with a good clean and a bit of fresh paint. Who knows, it's probably got more chance of making the century than I have. Thanks Dick, I think they are "Allen Key" or "Hex Key" grub screws but I won't bet on it though. hth Mike W, G8NXD I vote for the Bristol answer. I think I have a couple here but it would probably take a "crime scene" investigation to find them. I have a couple of BC221 and the newer version with a CRT. Bill K7NOM |
Mike W wrote:
On Mon, 18 Aug 2003 17:00:04 +0100, Dick wrote: I'm trying to get a hold of a tool that will undo grub screws securing the front panel knobs on my venerable BC221, can anyone suggest where I can get a hold of one, a modern equivalent and/or something that can be modified to do the job ?? Although all BC221s were provided with the tool (stored in a clip beside the spare valves) I've never seen one and can only guess that it must be something like a very small Phillips screwdriver head but with a parallel rather than tapered tip. It must also be less than 3/32" dia 'cos I've just tried to make one by hand out of 3/32" dia steel rod and that was too big, don't think my eyesight is up to hand filing the cruciform tip in any smaller dia rod, hence a request for help !! My BC221 is still furkling along after 63+ years (& only c/s - There, I've said it !!) out of calibration) but I think I should at least try & smarten up the case with a good clean and a bit of fresh paint. Who knows, it's probably got more chance of making the century than I have. Thanks Dick, I think they are "Allen Key" or "Hex Key" grub screws but I won't bet on it though. hth Mike W, G8NXD I vote for the Bristol answer. I think I have a couple here but it would probably take a "crime scene" investigation to find them. I have a couple of BC221 and the newer version with a CRT. Bill K7NOM |
You might check inside the instrument. A Bristol wrench was often
included in military gear under a clip someplace. I don't have a Bristol wrench for comparison any more, but I recall their cross sectional shape as resembling modern Torx drivers. It would probably take an unusually long one, and if it didn't fit well there'd be a danger of chewing the screw so it'd never come out. Might be worth investigating, though. Roy Lewallen, W7EL Bill Janssen wrote: I vote for the Bristol answer. I think I have a couple here but it would probably take a "crime scene" investigation to find them. I have a couple of BC221 and the newer version with a CRT. Bill K7NOM |
You might check inside the instrument. A Bristol wrench was often
included in military gear under a clip someplace. I don't have a Bristol wrench for comparison any more, but I recall their cross sectional shape as resembling modern Torx drivers. It would probably take an unusually long one, and if it didn't fit well there'd be a danger of chewing the screw so it'd never come out. Might be worth investigating, though. Roy Lewallen, W7EL Bill Janssen wrote: I vote for the Bristol answer. I think I have a couple here but it would probably take a "crime scene" investigation to find them. I have a couple of BC221 and the newer version with a CRT. Bill K7NOM |
Joe McElvenney wrote:
Hi, You are correct Bob, according to the SCR-221 technical manual (TM-11-300) there should be two Bristol wrenches (#6 & #8) in the spares kit. I have just tried the one I have on an old wreck of a BC221-T and it fits but don't know whether it is a #6 or a #8. It is just under a 1/10" across the flutes. I believe that during WWII there was a specially employed lady, complete with tattoos presumably, whose task it was to tighten the set-screws on all military equipment. She did such a good job that nobody except a certain candidate for the governorship of California has since been able to move them. Cheers - Joe I put a drop of "Breakfree" in the hole and wait a couple days to remove tight screws. -- Michael A. Terrell Central Florida |
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