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@Balki
Righto... its a tiagra caliper. I have a fully functional sora caliper here, exactly the same mechanism.
The right hand caliper arm is totally limp under load. I can close the caliper using gravity. The Sora one i need to squeeze against the spring.
The Tiagra one ahs the spring in place, it is moving in that little sheath thing that it slides through. Im stumped.
The spring seems to be doing nothing at all.