[Boatanchors] Removing knob with steel set screw

[WA5CAB at cs.com]

I have two suggestions you might try before cutting up the knob.  The set 
screw has probably slipped at some time in the past and raised a burr on the 
shaft, which cut a grove in the ID of the knob.  If the switch has a 
positive mechanical stop at the lowest band, you can try twisting the knob as you 
pull on it and see whether you can get the burr to cut into the bore and 
follow a helical path out.  If that doesn't work, you could try drilling a hole 
through the exact center of the knob down to the flat end of the shaft.  
Then use a gear puller whose drive screw (or an extension) will fit into the 
hole.  If that gets the knob off in one piece, you can plug the hole somehow 
and use the knob.

In a message dated 8/15/2009 4:05:15 PM Central Daylight Time, 
ianmwilson73 at gmail.com writes: 
> 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?

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480