Electronics > Repair
Coupler on old Hameg scope
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p2potter:
I retrieved my long lost Hameg HM204-2 from my attic and after a round of Deoxit, it looked pretty good. However, I noticed that one of the couplers from the front panel to a pot had broken. Attempts to glue the plastic back together failed as the torque of the set screw just splits it again (see pic).

I can find metal replacements on Amazon that should work, but they are metal rather than plastic. Would this be an issue? The coupler that is broken joins a 3" metal rod to a metal push switch/pot wiper for the trigger level control.

I could not imagine this being a safety issue, but possibly this might introduce some noise. Does anyone see any concerns with this repair? Not really important as this is my backup for my Siglent, but its always nice to have good working test equipment.

Thanks in advance,

Phil
bob91343:
I think metal should work fine.
jdragoset:
Try drilling two 0.035 holes (one each side of set screw) parallel to the shaft and use some SS safety tie wire, twisted tightly.
Glue and most plastics rarely work unless specifically intended.
Two long #1 bolts and nuts (m-1) would also work in place of the tie wire.   
p2potter:
Guys,

Thanks for the responses. I think i will just buy a coupler from Amazon and see how it works out. If it is not satisfactory for any reason and can try the drilling and screwing approach.

Thanks,

Phil
BrokenYugo:
Might also try a chunk of vinyl or rubber tubing. I've made couplers that way that lasted in more demanding service.
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