[ARC5] BC-221-D, tool needed to undo knobs

[hwhall at compuserve.com]

Xcelite driver number 9966 is indeed the .096" tip but I don't see one for .050".  Did you perhaps mean .060"?  The .060" tip is number 9962.

BTW, I can still get a few used Bristol DS0-111, DS-133 & DS-145 tools (handles with tips) cheap at the local surplus place.  Haven't seen any smaller ones in a long time.  There are some .096" L-shaped keys though.

Wayne
WB4OGM

-----Original Message-----
From: Roy Morgan <k1lky68 at gmail.com>
To: Leslie Smith <vk2bcu at operamail.com>
Cc: ARC-5 List <arc5 at mailman.qth.net>
Sent: Sun, Oct 1, 2017 7:52 pm
Subject: Re: [ARC5] BC-221-D, tool needed to undo knobs

The knob set screws on my BCC-221 AH accept Bristol 6-flute spline wrench of 0.096" diameter. This is the Xcelite driver number 99-66. 

I cannot verify that the earlier medium-base tube frequency meters used the same set screws, BUT,

The LM-20 here uses the same setscrews in three knobs and the CORRECTOR metal knob set screw accepts Bristol 6-flute spline wrench of 0.050" diameter. This is Xcelite driver 99-66. 

PS:  I have not heard of METRIC Bristol spline wrenches/screws. If they exist(ed), I'd be glad to get any available details. 

Roy sends.

> On Oct 1, 2017, at 5:50 AM, Leslie Smith <vk2bcu at operamail.com> wrote:
> 
> Hello all,
> 
> I wish to remove the F.P. knobs from a BC-221-D.  
> This is an early model with 5 and 7 pin tubes. 
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