Hi.
I have an old lawnmower with a 3.5 HP Briggs engine. The engine is worn out after about 20 years of abuse. It has a 21" blade and the shaft measures about 2 7/8" to the flat part where the blade is inserted. The blade holder is attached to the crankshaft with a big nut. I cannot see the threads. Anyone know if this is reverse thread or regular? I found some new engines on eBay for cheap but they don't appear to be threaded on the outside of the shaft. Is it very difficult to find parts to fit a blade onto other kinds of shafts? I don't seem to be finding any with outside-threaded shafts.
Thanks.