ok, so I'm a couple days late...
like I said, the crank is straight cut, not tapered, I could probably go without using the keyway and just loctiting it down, I guess that would be about the same as the normal method...
This engine seems to have a flat top piston, I haven't stuck a compression gage to it, but it started right up so I assume it's in pretty good shape. It's a 2 bolt jug, I haven't taken it apart any further than in the pics other than taking the muffler and carb off, looked good through the exhaust port, bit of blow by, but not serious.
yep, the poulan is a cantilever crank, I think that's why it's lighter, less "stuff", it can be seen in the last pic, the thing was less than 2.5 pounds as pictured, once converted to 24cc was still under 2.5 pounds... a friend needed a piston and jug for his actual weedeater, so that 24cc got donated, will probably get a bowman ring for the piston/jug I got from him since it just had a stuck ring, piston and cylinder are fine, it was a victim of being ran partially choked (so much for running lean and clean, it was even a two needle carb, I did him a favor and removed the limiters) and ran rich to death...
Buck, looks like you neglected to attach the pic