Roy,

McMaster-Carr http://www.mcmaster.com/ has self locking Threaded Inserts -
their PN 90248A016 is 4-40 threaded ID and 6-32 threaded OD - 10 per
package.

OTOH, Elecraft offers #5-40 taptite screws for those who have stripped the
threads - free on request.

73,
Don W3FPR

> -----Original Message-----
>
>
> I wonder if anyone has considered drilling out a hole in the middle side
> screw location on the KPA-100 big enough to force in an
> externally  splined
> insert that has a 4-40 internal thread.  The external spline
> would  make the insert
> grab the heat sink firmly so it would not turn with the  screw.
> Does anyone
> know where such an insert could be found, and has  anyone done this?  Roy
> Morris  W4WFB
>


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