Hi Norm
I thought I spied a ryobi/homelite air filter on the bench next to the saw blade - recognisable by the round indent from the round indent from the upright part over the choke plate.
The "PLT304..." trimmers - square with sloped front filter housing and the yellow choke lever that comes through the front on the ones from the late 90's to early 00's
For a 1/2 crank, those ones aren't too bad - at least they aren't pressed together like the later ones (can't remove piston without shop press). I have a few and they go well - couldn't give them away though.
Ozito used the engine later on in leaf blowers, albeit with slightly different exhaust studs (thicker studs)
Be careful, hope the guy doesn't cause any trouble
