[Hallicrafters] SR-150 Set Screws

[Charlie]

Do NOT attempt to use an Allen wrench on those set screws!     They require 
Bristol Spline wrenches, which are still available from any of the 
commercial hardware/tool distributors.  The Bristol company is still in 
business and you can check their website for info too.  Most sizes have six 
sides (splines), but some are four sided, so you can see how a regular Allen 
wrench would destroy them.

If you're buying the Xcelite brand units with the separate handle, you don't 
need to spend over 30 bucks on the whole set.  There are only four sizes 
that you'll ever need for  Hallicrafters & Collins equipment.   Just buy the 
individual inserts and one handle.   If needed, I'll look up their part 
numbers.

The Bristol drive will take much more torque than an Allen (hex) drive and 
have generally been supplanted by the simpler, but less effective  "Torx" 
drive.

73' Charlie k3ICH

.
----- Original Message ----- 
From: "Mike Peron" <mperon at san.rr.com>
To: <hallicrafters at mailman.qth.net>
Sent: Tuesday, March 21, 2006 12:15 AM
Subject: [Hallicrafters] SR-150 Set Screws


I'm trying to take off the knobs of my old SR-150 to do a little clean up. I 
can get an Allen wrench successfully into the larger knobs but having 
problems with the smaller ones like the RIT and Mic gain knobs. Can't seem 
to find an US size Allen wrench of the correct size. They are a bit rusty 
and I'm wondering if a shot of WD-40 would be prudent. Does anyone know the 
proper size or process for removing these vintage beasts ? The set screw 
almost looks rectangular. It is hard to see in there even with a flashlight. 
Would appreciate any guidance you folks can offer. My eyes are not what they 
used to be

73's
Mike WB6UTW
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