I professionally convert string trimmer engines, too, and sell prop shafts. I can't beat Scott's price (wish I could sell one that cheap)

, but I do sell a standard prop shaft with knurled facing for $25.00 plus S&H. 5/16-24 Thread, 1 7/8" long. Being in Texas, I am a little closer though! Ha!
Regards,
Mike McGraw,President
GCBM R/C Inc.
5009 Fairdale
Pasadena, TX 77505
281-998-2529