I have used the cylindrical fit loctites in power transmission assemblies for press on gears, its very strong, but check the temperatures. I wonder if YS would send you a replacement head? This has been a common problem.

http://www.loctite.com/int_henkel/loctite_us/index.cfm?verityspider=0&layout=4&productline=OEM5 010&path=Assembly%20Products|Cylindrical%20Assembl ies%20%28Retaining%29|General%20Purpose