sorry mike . I don't mean to offend. I have around twenty No 19s and a fair stack of spares. Like I said its a while since I had one on the bench and I am more than happy to doff me lid to your greater experience.
i have run a few and have a few running . I have the Ozstrralian manual and use Ozrstralian valves with an Ozstralian valve set with some hundreds of spares.
My experience of them, as an engineer, is a bit distant but don't recall the differences you refer to and I have not from memory had the problems you are making me aware off .
My 19s look just like those in the Canadian manual and my bits seem to be interchangeable ...
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