[Boatanchors] Mystery round plastic discs

[Richard Knoppow]

----- Original Message ----- 
From: "John King" <k5pgw at yahoo.com>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, December 28, 2010 4:00 PM
Subject: [Boatanchors] Mystery round plastic discs


>I have two MYSTERY round plastic discs that appear to fit 
>on a 1/4 inch shaft.
> The shaft holes have ridges as if they were to slip over a 
> shaft that had ridges
> on it to keep the discs from slipping and rotating on the 
> shafts.
>
>
> The discs are black plastic 2 3/16 " in diameter and 1/4 
> inch thick. Although
> they are solid discs the design has 4 triangular shaped 
> flutes on each side.
> These showed up on my work bench and were found during a 
> cleanup. The only piece
> of gear that I have worked on in that particular area is a 
> Hallicrafters SX 71
> receiver.
>
> Have any of you run across a piece of gear that has such 
> plastic discs? Your
> assistance will be appreciated to assist in identifying 
> these discs and the
> piece of gear they belong on. Thanks and 73, John, K5PGW


     FWIW, there are pots and switches made with shafts that 
are fluted and usually split so that they hold knobs by 
friction. The knobs that fit usually have a septum or a 
spring insert to fit into the split shaft. Do you have any 
radios with shafts like this?


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com