[Hallicrafters] Wrenches to remove knobs from SX 100

[wa1kbq at aol.com]

Collins chose to use Bristol drive set screws with radiused ends which are quite a bit friendlier to the shafts. Nice to be able to take something apart and not see the shafts all chewed up from prior history of removing and replacing or otherwise fiddling with the knobs.

-Greg



-----Original Message-----
From: John King <k5pgw at yahoo.com>
To: wa1kbq at aol.com
Sent: Sat, Dec 26, 2009 9:00 am
Subject: Re: [Hallicrafters] Wrenches to remove knobs from SX 100


Thanks Greg and all who have given such great information and advice. I really 
ppreciate the help. I am presently recapping an SX 100 and think I will need to 
emove the front panel. 
fter it,  I have Collins 75A1, A2 and A4 receivers, an SX 28A, and SP 600 JX 17 
o recap. just as a beginning. Waiting on caps for the A4 to come in. Thanks to 
ll and Happy NEW YEAR. 73, John, K5PGW

----- Original Message ----
rom: "wa1kbq at aol.com" <wa1kbq at aol.com>
o: k5pgw at yahoo.com; hallicrafters at mailman.qth.net
ent: Sat, December 26, 2009 7:48:35 AM
ubject: Re: [Hallicrafters] Wrenches to remove knobs  from SX 100

cMaster-Carr is an industrial supply house in Atlanta and is an excellent 
ource for different types of replacement setscews and setscrew wrenches. 
etscrews are available in many different types and drive styles with different 
ypes of formed ends which include, flat, pointed, cupped, and radiused 
epending on the degree of "locking" or "resetability" desired. The variety we 
re mostly concerned with in the case of Hallicrafters equipment includes 
-flute and 4-flute Bristol types which is an internal splined drive and Allen 
ypes which is an internal hex drive with "cupped" ends. Hallicrafters equipment 
s often found with a mixture of these three different drive styles. Try to look 
losely at each knob's setscrews to determine what you have before attempting to 
nsert a wrench. For example, an Allen wrench will loosely fit the 6-flute 
ristol but enough force will cause it to slip and ruin the setscrew's internal 
plines. If this has happened the
correct Bristol wrench wi
l probably no longer fit the setscrew. There is a procedure which is usually 
uccessful in repairing Bristol setscrews damaged by Allen wrenches, just ask if 
eeded. 
The cupped ends of the hardened setscrews are designed to bite into softer 
hafts which will cause a burr to be pushed up. Sometimes it is necessary to 
ush burrs back down to get the knobs off. I use a setscrew with the end ground 
lat to accomplish this. Just wiggle the knob slightly clockwise and 
ounterclockwise back and forth as you gently tighten the flattened screw and 
he knob will soon come off.
The decorative front panel nuts are another problem. One often encounters 
revious owner tinkering which usually includes barked up decorative nuts with 
lier gouges in the paint around the nuts. General Cement once produced tools 
or splined decorative nuts but because there is no standard spline count for 
ecorative nuts among manufacturers the GC tools never fit correctly and will do 
s much damage to the nuts as pliers. I bought some about ten years ago and when 
 discovered this I tossed them out. The earlier mention of round nut wrenches 
or cameras from Micro Tools is the best recommendation.
Sometimes you have access to the hexnut on the backside which is the best way to 
oosen if you can get to it. Sometimes you need a thin wrench to get in and 
ometimes you will need a thin wrench which has a bend. Sometimes there is no 
ccess and you have to loosen the decorative nut.
-Greg

-----Original Message-----
rom: John King <k5pgw at yahoo.com>
o: hallicrafters at mailman.qth.net
ent: Fri, Dec 25, 2009 10:03 pm
ubject: [Hallicrafters] Wrenches to remove knobs from SX 100

 need to remove the knobs and front panel from my SX 100. I note that the 
rews in the large knobs are larger than the screws in the  small knobs. They 
ok like screws that require Bristol wrenches. Is that correct and  is there a 
commended source for the correct set?
oes anyone  have suggestions for getting the nuts off the switches and controls 
n the SX 100 front panel without damaging the front panel? Suggestions 
preciated. 73, John, K5PGW
      
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