[Collins] 74A-4 4:1 Tuning Knob

[Roger Shultz]

Hi Larry,

Assuming it is the original 4:1 knob, then all of them that I have here work 
with my Xcelite 99-62, 6 flute Bristol blade.

If you have a different knob, such as the machined aluminum made by Mac 
McCullough or the recent repro's by Dutch, I have a couple of those too on 
radio's in my shop which I can check.

I agree though that even with the correct blade it takes some patient 
feeling to hit that hole and get the blade in the flutes. It is always 
possible that you have a combination of screws because one or both were lost 
at one time, so all I can do is wish you "good luck"!

73, Roger NJ2R
----- Original Message ----- 
From: "Larry Clark" <k0rs at augwest.com>
To: <collins at mailman.qth.net>
Sent: Wednesday, June 07, 2006 5:15 PM
Subject: [Collins] 74A-4 4:1 Tuning Knob


Gentlemen,

What type of set screw does the 'A4 tuning knob have?  I was expecting the 
standard Bristol set screw, but I can't get any conventional tool (Bristol, 
Allen, or straight slotted) to index the set screw.  Very difficult to 
illuminate the screw through the tiny access hole, too!

TIA & 73,

Larry, K0RS
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