[AMRadio] Need some assistance on a B&W 5100 !

[Donald Chester]

>
>>From: Theohioexpress at aol.com

>>Can anyone help me? I have a B&W 5100 I need to take a part but, the knobs 
>>do
>>not seem to be Allen screws. The last thing I want to do is damage the
>>fasteners. Are they Bristol or maybe U.S. standard screws or  I'm mistaken
>>and they are Allen fasteners?

I had the same problem with a 75A-4.  A previous owner evidently had tried 
to use a regular Allen wrench to turn the spline screw.  The result was a 
rounded out hole in the head of the screw.  I finally got it out by special 
ordering a # 49 lefthand drill bit that just fit in the rounded out hole 
enough that it would bite into the metal when the drill bit was manually 
rotated.  At first it did not want to move, until heat was carefully applied 
using a homemade long tip on a soldering iron and a blob of heat sink 
compound.  I finally got it out, and found a replacement screw in my junkbox 
- a plain flat slotted screw the proper size and thread pitch!

BTW, the proper term for these screws is BRISTO, not Bristol.

Bottom line:  make sure you know exactly what kind of driver to use with 
those screws before you attempt to turn them.


Don k4kyv



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