I had promised myself to finish this project before the end of the year ... so here is the rest:
a)
It swelled me (pun intended) to buy 25 € in the USA or in China a wearing part... so I did not order the reed valves ...
b) So I tried a repair with ...
a cut glass jar cover (like a pig) and a "normal" aluminum rivet that I ground on the piston side (there is a bore in the cylinder head which still leaves enough material to cut the rivet flush)
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c) To my surprise
it works ... pretty well :
the compressor goes back to 8 bars without worries... I have not tried more: from 6 bars I have a leak at the pressure level ... as I never use these pressures I will not repair it ...
d) The most annoying thing was to put together this crap plastic fairing!
It remains to be seen the hold over time ... I imagine that the treatment of the cover will protect the valves ... for the mystery rivet ... I will keep you posted.
This compressor must run 10 hours maximum per year ... so it may take a few years!