Cylinder & Piston Progress

Soldered up the cylinder flanges, marked out, drilled and tapped the inboard cover and flange. Everything seems ok except I trashed the thread in one hole :( Threading M3 about 2.5mm deep into a blind hole is not the easiest task...it might be a case of soldering in a stud, not ideal but can't think of an alternative.

The piston was next; the moment of truth is seeing if it has a good and equal fit for the length of the cylinder bore and it seems so. Hurrah!