I've got a pair but the adjuster screw is threaded on both. I used them bodged for years in the hope an easy fix might present itself. Nothing did. Can have them for free, just postage.
I'd be interested in these if OP doesn't.
@sorethroat started
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I've got a pair but the adjuster screw is threaded on both. I used them bodged for years in the hope an easy fix might present itself. Nothing did.
Can have them for free, just postage.