[R-390] R390 knob set screw

[Barry]

Apparently they do make #8-36 helicoil inserts.  I found the helicoil taps
for them but haven't found the coils.  It would make for some good threads
if you could find them (and have the knack for drilling, tapping, and
inserting them).

Barry - N4BUQ

----- Original Message ----- 
From: "Barry" <n4buq at aol.com>
To: "R-390 reflector" <r-390 at mailman.qth.net>
Sent: Thursday, April 14, 2005 11:43 AM
Subject: Re: [R-390] R390 knob set screw


> I wonder if anyone makes #8-36 helicoil thread repair inserts.
>
> Barry - N4BUQ
>
> > Dan,
> > my notes say it's 8-36 UNF thread, yet another oddity of the 39x's. If
you
> > had the tap you could epoxy the hole and drill and retap it but a
> > replacement knob can be gotten cheaper.
> >
> > Sometimes you can smear some JB Weld across just the damaged area, let
it
> > firm up a bit, and then use the setscrew itself as a tap, then remove it
> and
> > let the JB cure. If your lucky it can give the setscrew the little extra
> > bite it needs to do the job.
> >
> > That phenolic insulating shaft on the 390 is pretty tough, I wouldn't
> worry
> > too much about hurting it.
> >
> > John
>
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