[R-390] Antenna trim repair

[Larry H]

It looks like a rolled pin to me and so probably not tapered.  I like the
idea of using penetrating oil on it.  If you had a tool to press it out,
that would be better than driving it out (which would cause lots of shock
damage to tubes and crystals, if still in).  The shaft is insulated from
frame with a fiber bushing and washer, so they will be damaged easily.
This is a tough one.  Best of luck.

Regards, Larry

On Tue, Jun 19, 2018 at 8:31 AM, Manfred Antar <manfredantar at gmail.com>
wrote:

> Try a drop or two of Kroil , leave to penetrate overnight.
> Then try to push out. Kroil is amazing on stuck nuts and bolts, stuck pins
> and such.
> Manfred
>
> > On Jun 19, 2018, at 8:22 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
> >
> > Hi
> >
> > The gotcha is the material of the roll pin vs what it’s pressed into.
> Put two different metals next to each other
> > and you can get corrosion due to the electro chemical differences in
> them. That corrosion will quite effectively
> > weld something like a pin in place.
> >
> > Bob
> >
> >> On Jun 19, 2018, at 11:03 AM, Barry <n4buq at knology.net> wrote:
> >>
> >> I may be wrong, but isn't that just a roll pin that can be
> pressed/punched out?  I seem to recall having this same problem but don't
> remember if I ever removed that pin but I _think_ I did...
> >>
> >> Thanks,
> >> Barry - N4BUQ
> >>
> >> ----- Original Message -----
> >>> From: "Dave Kirk via R-390" <r-390 at mailman.qth.net>
> >>> To: "R390 Reflector" <r-390 at mailman.qth.net>
> >>> Sent: Tuesday, June 19, 2018 9:13:25 AM
> >>> Subject: Re: [R-390] Antenna trim repair
> >>>
> >>> Not sure drilling is an option that pin is probably harden steel I'll
> end up
> >>> breaking drill bits trying to drill out the pin CRAP! Now what? Sounds
> like
> >>> I either live with it or try and find a replacement.
> >>> Dave
> >>>  On Monday, June 18, 2018, 8:04:48 PM PDT, Stan Gammons
> >>>  <s_gammons at charter.net> wrote:
> >>>
> >>> I had one that was like that.  I tried to remove the pin with a drift
> >>> punch but was never able to remove it.  Ended up replacing the entire
> >>> assembly with a part from another RF deck. In the end that RF deck
> >>> turned out to have other odd problems, so I replaced it.
> >>>
> >>> Good luck.
> >>>
> >>>
> >>> 73
> >>>
> >>> Stan
> >>> KM4HQE
> >>>
> >>>
> >>> On 06/18/2018 08:21 PM, Dave Kirk via R-390 wrote:
> >>>> Has anyone had any luck getting into the antenna trim can to clean
> the cap?
> >>>> The antenna trim on my 390a is intermittent as the knob is turned it
> acts
> >>>> like the capacitor contacts need a cleaning real bad. The gear on the
> >>>> capacitor shaft is pinned on I'm not quite sure how to remove the pin,
> >>>> maybe drill out the pin ouch! Why the heck did they pin this gear on
> seems
> >>>> like two set screws with loctite would have worked just fine.
> >>>>
> >>>> Dave
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