Alright Andy
I used to work for a company that where a dealer for mycoms and I have seen a few with snapped shafts I once went into a plant room and found the drive pulley the other end of the plant room when we had the shafts analysed for metal fatigue we found they were made with scrap steel [Made in Japan] they were an old design that are just speeded up to get more duty out of them that was the recips, I once stripped down a compressor and had it all laid out for a rep in Belguim to come and inspect he spoke very poor english and asked for a big crate and everything got shot in I thought the Japs would teach us something LOL!!!!! they may be better now though???
Regards Dave