Looks like what my luck is most of the time..I dont just break things,I destroy them!..
I had a 5 HP Tecumseh on a snowblower that had a crankshaft do the same thing one day--the clutch flew off into a snowbank,and I thought it had just loosened up and flew off,but when I dug it out of the snow (it melted a foot wide hole in the drift!),it still had the end of the crankshaft stuck in it!..it busted clean off,flush with the block,leaving me with a perfect running,USELESS engine!..
Cheapest fix for that will be to go scrounging at mower shops junk piles,maybe they'll have a dead starter with a useable armature..all the ones I have are 110V versions from snowblowers,not sure if they are the same,I think not due to the voltage diference and AC/DC ..
It's episodes like this,that ALL tractors should have a recoil or rope start "back up",so you wont have a long PUSH back to the garage!..they always seem to have a major catastrophy when your a mile out in the woods and have a trailer full of wood on it,at least thats when mine like to die on me!--either that or when I'm near or in the ROAD mowing!.... one good reason to have TWO or more tractors,is so you can tow the dead one back to the shop,if nothing else!....