The first (and last) TFR I worked on had a defective crankshaft, which I explained to the people at Cosmo had failed at 17 (10+7) miles.
Althought his moped had been out of warranty for years, it belonged to the original owner.
Cosmopolitan found that indeed the crankshaft was defective and sold us the parts at cost. Considering they were under no oblogation to do so, this was a good situation for all involved. That TFR is still going strong, and here's a good word for Cosmopolitan.
I think you'll be satisfied with the results.