Old Homelite Clutch Spider/Drum Question for C-Series & XP series

[weimedog]

I have XP-1000, 1020 series saws. They have the threaded type spiders.
Replacement Drums/clutches from Oregon are available according to
part numbers but they are slightly different that the OEM Homelite drums.

The origional Homelite Drums had a inner race (cylindrical part) that slides
over the crank shaft. The Oregon parts just have a needle bearing that
rides directly on the crankshaft with no separate inner race.

My question is will those oregon drums work? Reason for the question
is I think the clutch spider threads until it stops on that "inner" race
on the origional Homelite parts and with the oregon that would bind up
that drum unless you use a thinner thrust washer between the clutch
drum and the oil pump. That would allow the spider to stop when it runs out
of threads on the crank shaft.....is that OK??? My instincts are that's
not the right way but the parts numbers provided by oregon only have
drums without that inner race.

Whats your opinion?

[Bill]

Hate to jump into something I don't know the answer to but maybe my experience working as a mechanic at a car dealer back in the 70's will help -

The manufacturer used to change parts/designs in the middle of a production run/model year or just switched suppliers - for example you could ask for a wheel cylinder ( or power steering pump or whatever ) for a 1973 and you'd need the VIN to get the right one since they switched suppliers/designs mid year.

Sounds like if you have the parts in front of you and they don't match . . . maybe they upgraded mid run ?

Sorry I don't have more than an opinion but I was always told to go with the guy that has it in front of him.

Good Luck