we just had this discussion the other day on another thread.......LOL[8D]

[link=http://www.rcuniverse.com/forum/m_4538314/anchors_4539289/mpage_1/key_/anchor/tm.htm#4539289]How to replace an engine ring?[/link]

the link within was very helpful to me.....

[link=http://www.raptortechnique.com/enginebearing.htm]Engine Bearing Replacement[/link]

hope this is as much help to you as it was to me........