[Milsurplus] Proper size Allen wrench for APR-4 tuning unit frequency knob?

[Al Klase]

If the recessed-head screws are not fractional-inch hex (Allen), my next 
guess would be Bristol spline.  These are pretty obvious under 
magnification.

Al

On 1/17/2013 11:05 AM, Jack Sullivan wrote:
> I just received my 2 missing APR-4 tuning unit knobs but none of the set of wrenches I bought at Dayton some years back seems to do the trick. My neighbor has a box filled with every conceivable size of hex key but I thought I'd ask before starting that project.
>
> As a side note, the TSA at the Dayton airport inspected the set of wrenches as I was leaving & seized the 3/8"as that reached the minimum criterion for a non-allowed weapon.
>
> Jack
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/