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The crank was machined from brass, looks a bit like a wedge of cheese. The pin was machined from mild steel and threaded to locate it to the crank.
The conrod was again machined from brass with two ball races at the big end and a plain bearing at the small end - probably should be the other way round as could then avoid any oil near the cylinder.
If you have made a similar engine and would like to share your experience we would love to hear from you - ed.