I only have 1- YS 1.40 and today the threads in the head stripped out at the exhaust header in flight somehow. Is there anything that can be done to repair this short of replacing the head? Any suggestions/contact info on who can repair it?

in radio control modeler magazine. clarence lee advertises in there that he has a special insert to repair the threads in the head. i have never used him so i cannot vouch for his work or timetable.