[R-390] Wanted: Detent Spring

[Jordan Arndt]

I've seen them with wear holes at the contact point, but never a broken one. 
They can be adjusted for tension. Even if it's broken, the MC shaft should 
still drive the mechanism properly, just without the appropriate detent.

I didn't know that part was Beryllium copper (the dust of which is toxic) 
based, but it does make sense given the function of the part.

I've pulled a lot of RF decks, but never needed to disassemble the drive 
train...Is the mechanism still siezed or bound up..?

73...Jordan VE6ZT


----- Original Message ----- 
From: "Jacques Fortin via R-390" <r-390 at mailman.qth.net>
To: "'Paul Roche'" <rochep at comcast.net>; <r-390 at mailman.qth.net>
Sent: Friday, July 03, 2026 1:52 PM
Subject: Re: [R-390] Wanted: Detent Spring


For the ones who may asking which "detent spring" Paul is asking about, this 
is the one that indexes the rotation of the MHz shaft thru the notches in 
the differential drive when it turns.
Meaning, the one in the attached .pdf
Paul, it can be bad luck, but I believe that you found why the "detents" 
were so weak when you turned the MHz shaft.
Maybe it was already cracked...

73, Jacques, VE2JFE in Montreal



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