Alpha Bravo,

Your not going to like the answer....

There should only be the two screws ( one screw on earlier HRO dials )
and the knob should slide off.

I had fits removing one a couple of years ago. I tried copious amounts of
thread lubricant and gentle twisting and tugging.

The end result was surgery - I had to crefully cut the bakelite knob
around the shaft to remove the pieces from around the shaft.

I found another HRO knob on Ebay for $15. The original skirt was left
intact and OK.

I also have a modified NC-100 for the Dept of Commerce. Fun little radio.

L Ron H


"ablebravo" wrote in message
ups.com...
having trouble with this, and have the brief instructs from io.com,
which i think are from the hro 50 instructs. have removed two set
screws which are accessed thru a hole in the black knob part of the
dial. turn the dial to 250, and have some play -- it moves back and
forth on the shaft for about 1/16" of an inch but does not come off.
reluctant of course to pull hard. there does not *seem* to be a catch
or some way to release from the back side, nor any other screws.

this is a somewhat unusual set of about nc-100 vintage (1939-41-
ishmade for precursor to FAA). has the sliding coil tank, and
receives usual shortwave bands plus an old airband. knob is black,
dial is grey. can't get the faceplate off for redo until dial knob
removed.

have original docs, but instructs for this not given there. bama, etc
no go for further docs on this unit.
ab.