[R-390] Removing Megacycle Change shaft

[Jordan Arndt]

Does anyone know what the ID of that broken clamp is...?  I think I have a 
few of those and even more of the smaller diameter (1/4"?) clamps with the 
square nut and appropriate bolt...

73...Jordan VE6ZT



----- Original Message ----- 
From: "PAUL ROCHE via R-390" <r-390 at mailman.qth.net>
To: <r-390 at mailman.qth.net>
Sent: Monday, June 15, 2026 6:24 PM
Subject: [R-390] Removing Megacycle Change shaft


> Just got my first R-390A and the Megacycle Change shaft just spins and 
> spins; the Oldham coupling clamp is broken. But the problem is to remove 
> the shaft I need to remove the circular "ring" attached to it. I am 
> looking for a setscrew, but this doesn't look like any setscrew I have 
> ever seen! I might have to drill it out unless someone has a better idea; 
> what is this thing and how to i get this circular ring loose so I can pull 
> the shaft to add a new clamp?
>
> Paul


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