I have a WS7 in good shape but I broke the clutch retaining screw. It's flush with the crankshaft so I don't think it's coming out. Did the WS7 share a crankshaft design with any other models? It's a nice old engine so I'd hate to give up on it. Thanks for any help. Brett

Just cut a slot in it and you can take it out with a normal screwdriver. If it is tightened with loctite heat it up!

If you get a slot in the crankshaft, that does not matter, it only needs to hold a bearing.

I've done that before but there's no screw left to cut a slot in. I cut a slot in the head but one side of the screw broke off. I kept trying different methods that have worked in the past for me with no luck. It's flush with the shaft now so I'd have to really cut into the shaft.

Realy, it is no problem if the slot goes a bit into the crank.to get a slot into the screw

Yeah, I've got nothing to lose. Even if I can find something to cut a thin slot in that smal diameter, it would take a tiny screwdriver to get to it. I really doubt that a screwdriver that small will have the strenth to remove it. I may try it anyway

Dremel with a grinding/cutting disc.

If the head of the screw is off then the screw should not be tight. Only when locktite is used you need to heat up that part of the crank to loosen up the loctite.

Think of it as a lightened crankshaft.

Like I said in the above posts, the screw is flush with the shaft, nothing to grab onto, cant get a screwdriver on it. I'd have to slit the crank and the screw and try to use a jewelers screwdriver to get in there. I've used the dremel method many times before, it just didn't work this time. Thanks for the input though.
My question at this point is did any other engines of that Era share a crankshaft with this model?

I have some engines with that exact same slit. I too had that screw stuck in flush with the crank. Just go ahead and cut it with dremel and use small flat head screwdriver. Has no effect on the performance of the motor whatsoever just looks not nice

Any crankshaft from an S7, S5, S3 will fit the WS7 but the WS7 series of engines had a bi-turbo crankshaft with the special coating on the crank pin.