In article , Adrian says...

OK, so you can get a G-clamp onto the piston.

It's just down to "Will the clamp turn it rather than push it?" (Very
unlikely ime of turny-piston calipers) and "Is there anything solid
enough on t'other side...?"

Thankyou.

Either way, it's still a bodge.

Didn't say otherwise.


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Conor

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