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Re: [Amps] Stuck setscrews

To: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Subject: Re: [Amps] Stuck setscrews
From: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 08 Dec 2017 20:50:01 +0800
List-post: <mailto:amps@contesting.com>
Angle grinder or oxy torch.

On 8/12/2017 7:27 PM, Victor Rosenthal 4X6GP wrote:
I have an older Palstar AT-Auto tuner. It uses stepper motors to turn a rotary inductor and a capacitor. It works very well in my station (or it did).

The motors are connected to the coil and capacitor with semi-flexible insulated couplings that are made out of some kind of plastic strip. The plastic on the one for the capacitor has disintegrated. I have a good quality metal and ceramic coupling to replace it with, but I can't budge the setscrews holding the old one. Allen wrenches twist to no effect.

The screws are held with some kind of glop. I don't think it is Loctite but I don't know for sure. I put some penetrating oil on them and am waiting to see if that works.

I suppose I could drill them out if needed, but that is a last resort because I am afraid of damaging the motor or the capacitor. Any suggestions?


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