[Boatanchors] Re:part needed

[WA5CAB at cs.com]

I remember the things but haven't seen one in years and have no recollection 
of who made them or what the internal mechanism was like.  But I'm pretty sure 
that they were marketed as an add-on.  The ones I recall were black, about 1" 
OD and 1/4" thick.  Replaced the nut that originally secured the pot.  The OD 
was either fluted or knurled and it was about a 1/8 or 1/4 turn device from 
free to locked.  The knob had to be relieved on the back to clear the hex nut 
on the front of the device that you used to tighten it to the panel (a lot of 
cast aluminum knobs are made like this - the smaller ones on the R-390 for 
example).  In between the tightening nut and the OD part that you turned to lock 
or unlock was a surface that moved up and down.

In a message dated 1/2/2009 7:50:00 PM Central Standard Time, 
anchor at ec.rr.com writes: 
> Hi Bob,
>     I don't remember an add-on locking mechanism, but seems like the locking 
> 
> pots had a shaft bushing that extended further than normal, was slotted, had 
> 
> a tapered OD and a tapered nut that screwed down on it, thus squeezing the 
> bushing down onto the shaft &locking it.
>     Hope that's clearer than mud.  Was there an add-on?
>     (p.s. got one of those TR-4's going)
> 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: "Bob Hardie- W5UQ" <W5UQ at verizon.NET>
> Cc: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
> Sent: Friday, January 02, 2009 7:45 PM
> Subject: [Boatanchors] Re:part needed
> 
> 
> >Does anyone remember the "locking mechanism" used on potentiometers?
> >You would take the knob off and screw on a locking mechanism that would
> >hold the setting.  It was for NORMAL size pots.
> >
> >Well, I need one or actually two, for my adjustable power supply.  I
> >keep accidentally hitting the settings.
> 

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