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Repair of Set Screw Attachment for Tek-made VAR Pots
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Quite a few years ago, I came across my first broken Tek-made VAR pot, the grey plastic ones. The plastic had broken near where the shaft enters, so that the set screw could no longer bind tightly to the shaft. As spares seemed like they might be hard to find, I came up with a more permanent solution, which you can see here:
/g/TekScopes/photo/262268/1 and also the following photo These rings are tapped 4-40, the same as the OE set screws, but the ring encircles the cross-shaped portion of the pot allowing plenty of tightening of the set screw. The new, longer, set screw passes thru the original 4-40 hole, but does not use those threads, so this repair will fix a pot with stripped threads or fractured plastic there. I made a supply of these for myself and have used a half dozen of them on various 3 series plugins. They take up almost no more room than the original pot, so I've yet to encounter a place where this wasn't a quick and neat fix. I have a small supply of these if anyone needs one, or feel free to copy the idea and make your own. |
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Quite an elegant solution!
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Paul On Fri, Mar 26, 2021 at 02:20:11PM -0700, Jim Adney wrote:
Quite a few years ago, I came across my first broken Tek-made VAR pot, the grey plastic ones. The plastic had broken near where the shaft enters, so that the set screw could no longer bind tightly to the shaft. As spares seemed like they might be hard to find, I came up with a more permanent solution, which you can see here: --
Paul Amaranth, GCIH | Manchester MI, USA Aurora Group of Michigan, LLC | Security, Systems & Software paul@... | Unix/Linux - We don't do windows |
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You ought to upload the article to TekWiki at w140.com .
Dave Wise ________________________________ From: [email protected] <[email protected]> on behalf of Wayne via groups.io <WAYNECL@...> Sent: Friday, March 26, 2021 2:43 PM To: [email protected] Subject: Re: [TekScopes] Repair of Set Screw Attachment for Tek-made VAR Pots Nice solution! Haven't run across a need for one yet, but if I do, the lathe is right there waiting! Thanks for the post and the nice pictures! |
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widgethunter
Nice! Been looking for a fix for the 1A4.Wouldn't mind getting some.Bernd Schroder
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-----Original Message-----
From: Jim Adney <jadney@...> To: [email protected] Sent: Fri, Mar 26, 2021 2:20 pm Subject: [TekScopes] Repair of Set Screw Attachment for Tek-made VAR Pots Quite a few years ago, I came across my first broken Tek-made VAR pot, the grey plastic ones. The plastic had broken near where the shaft enters, so that the set screw could no longer bind tightly to the shaft. As spares seemed like they might be hard to find, I came up with a more permanent solution, which you can see here: /g/TekScopes/photo/262268/1 and also the following photo These rings are tapped 4-40, the same as the OE set screws, but the ring encircles the cross-shaped portion of the pot allowing plenty of tightening of the set screw. The new, longer, set screw passes thru the original 4-40 hole, but does not use those threads, so this repair will fix a pot with stripped threads or fractured plastic there. I made a supply of these for myself and have used a half dozen of them on various 3 series plugins. They take up almost no more room than the original pot, so I've yet to encounter a place where this wasn't a quick and neat fix. I have a small supply of these if anyone needs one, or feel free to copy the idea and make your own. |
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