ST70 Crankshaft

Hi all

I've snapped the thread off the end of the crankshaft for my ST70 and I'm having trouble sourcing a decent replacement. Does anyone have a scrap engine available with a good crankshaft that I could buy? Or any suggestions for a decent supplier!

I bought a cheapo one off eBay but it would seem that the tapered nose is about 15mm too long.

Thanks

Richard