[Boatanchors] Removing knob with steel set screw

[Al Parker]

Hi Ian,
    Another possibility -- since the setscrew has scored the shaft, take a 
longer setscrew and grind the end to a flat, removing the cupped portion. 
You'll have to do this with a cup of water and quench the screw regularly 
during the grinding to keep it's temper.  Then insert the new flattened 
screw in the knob fairly tightly and try to burnish the scored edges down, 
by turning the knob and holding the shaft, or against a stop if that's 
possible.  Work the knob, with flattened screw, along the length of the 
shaft in the proper area as you turn it.
    Good luck, it does work.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

"there is nothing -absolutely nothing- half as much worth doing as simply 
messing about in boats."
   Ratty, to Mole



----- Original Message ----- 
From: "Ian Wilson" <ianmwilson73 at gmail.com>
To: "Boatanchors" <boatanchors at mailman.qth.net>
Sent: Saturday, August 15, 2009 5:05 PM
Subject: [Boatanchors] Removing knob with steel set screw


>I have a Johnson Viking 122 VFO. The band change knob will turn freely on 
>the
> shaft if I loosen the set screw, but it won't pull off the shaft.
>
> The VFO is mounted in an ugly chassis/PSU that I would like to free it 
> from.
>
> I can't see enough of the shaft to grab hold of it, so any pulling force 
> will be
> applied to the switch, probably with disastrous effects.
>
> Is there anything I can do other than cut the knob off the shaft?
>
> 73, ian K3IMW
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