Thanks a lot for your acute answers John.
As mechanical solicitations on the piston are mostly in shearing, 6061 may be
indeed
a good choice, and it is easier machined than 2017.
If I can't find any "fresh" new piston, then I will make rebuild one this way.
Tenant, the original MonoW Caliper Piston diameter is 1'3/4 (44,5mm), a
dimension
quite frequent in the Europa (External diameter of the torque tube, and of
the pitch longitudinal tube in particular...)
And yes, all pistons I had in hands were in aluminium alloys
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Franzgo
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