I am having a hard time locating a useable working crankshaft for a 18HP Briggs Twin I/C opposed horizontal engine. The model is 422437 type 1268-01 code 91090612. I cant buy a new one they are not available anymore.The engine is on a YardMan GT18 and it has a broken rod.The crank has a gouge in it and the engine shop said they could grind it but I cant get an under size rod, not available.I can get a standard rod however.I have been checking for crankshafts on Ebay nothing there.I have called numerous large repair shops and a few lawn mower salvage yards but no results.I was hoping somebody reading this would have or know a place that might have a good used crankshaft.Any help would be appreciated! Thanks