ORIGINAL: Dzlstunter
Off topic, but after I looked at the Du-Bro chart, I went to the Great Planes chart to confirm that O.S. engines used 1/4"-28 threads or 5/16"-24 threads. Since I haven't had to replace one, I had no idea that they weren't metric. Anyone know why not? Dzl
Because we'uns don't like no metric stuff. We tolerate it but if'n you want'un to sell it to us'ins you need to take care of us'ins. Seriously, it is what the market demands. Since the US of A is big market, they tend to satisfy us. Recently, I acquired a Checz engine and had to buy a metric reamer for almost $20. All other engines seem to be old English (which I like and what I grew up with).
So personaly I think all the shafts should be in inches not millimeters.
Cheers,
Chip