[Hallicrafters] SX-100 knobs.

[kiyoinc at attglobal.net]

A fellow gave me an SX-100 (story at www.kiyoinc.com/heathstuff3.html)

I've been tuning around with it and have written a couple status
reports for the giver.  I owe him the reassurance that I was treating
the radio well.

I noticed that the bandspread knob was missing the inner "bright".  I
mentioned that in one of my status reports and he offered to "turn" one
on his lathe if I would return the knobs to him.

I got a set of spline wrenches from McMaster and discovered that the
spline wrench will not go into one of the two setscrews.  I was able to
remove the setscrew using a standard hex allen wrench.  

Upon closer inspection, it is definitely a spline setscrew but probably
banged up.  I haven't looked at it using magnification. 

Anyone know how to "touch up" a spline set screw?  Is this a job for a
teeny-tiny grinder, a disection microscope?  I have a Dremel tool and a
American Optical stereo microscope but haven't worked on anything this
small.

This SX-100 has non calibrated Notch Frequency and Depth knobs.  I did
a websearch and saw serveral folk looking for these knobs for SX-100s'.

The knobs on my SX-100 are very Hallicrafters looking.  Black, narrow
finger groves, brights.  

It's odd that several SX-100's would turn up with non-standard knobs.
Especially as Hallicrafters used spline setscrews.

I'm guessing that Hallicrafters did a run of SX-100's with generic
Notch knobs.  If so, I'd guess that these are rare collectables.

de ah6gi/4   Heathkit boatanchor fixer also working on a Signal/One
CX7A and a Hallicrafters SX-100.