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

[WA5CAB at cs.com]

I am sorry to have to say it, but that is very bad advice.  Either the 
Bristol or the Torx are vastly superior to Allen in the smaller sizes against 
the wrench turning in the screw and having to be drilled out.  If you try to 
loosen a #8 or smaller Allen in older equipment and it works, you are lucky.  
If it doesn't work the first time, you are up the creek.  Twisting an Allen 
driver in an Allen screw once almost always ruins both the screw and the 
driver.  We had an example just today in a piece of pipeline inspection 
equipment.  The #8-32 Flat Head Screws were bought and installed last Spring over 
my objections.  The originals had had the Canadian square drive heads.  When 
removed, none had torqued out despite having been installed about 1998 and 
run in several pipelines.

In a message dated 10/03/2017 15:25:13 PM Central Daylight Time, 
releazer at earthlink.net writes: 
> A small screwdriver of the right size might work.  Wedge it in there.
>   
>  I have not tried it yet but an undersized Torx might work, too.  I had to 
> buy a couple of sets of small Torx in order to work on a Tek scope.
>   
>  And then when they are out, throw away those Bristols and put in some 
> Allens - which is what I did with the Torx screws.
> 
> Wayne
>  WB5WSV
> 

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