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

[WA5CAB at cs.com]

I've never heard of a metric Bristol, either.  The metric rough equivalent 
is the Torx.  Similar to the Bristol in that it's fluted but the spline 
cross sections are quite different. 

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480 

In a message dated 10/01/2017 20:52:36 PM Central Daylight Time, 
k1lky68 at gmail.com writes: 
> 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.
> 
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