|
Refurbishing BC221
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 |
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 It has been many years since I had a BC-221, but I seem to think that a Bristol wrench was needed to remove the knobs. No bets, however. Bob, W6NBI |
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 It has been many years since I had a BC-221, but I seem to think that a Bristol wrench was needed to remove the knobs. No bets, however. Bob, W6NBI |
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 |
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 |
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 |
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 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. As one who converted a lot of WWII surplus gear for Amateur Radio use, I often hoped the guy who invented Glyptol got sealed in his coffin with the stuff. Doug Moore |
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. As one who converted a lot of WWII surplus gear for Amateur Radio use, I often hoped the guy who invented Glyptol got sealed in his coffin with the stuff. Doug Moore |
|
| All times are GMT +1. The time now is 03:02 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com