Thank you, gentlemen. I didn't know the S8 had a "convertable" tip. So take a little off the bottom of the top to bring it's diameter up to match the tip, then deepen the bearing recess, probably by the same amount you took off the bottom of the top? I love everthing about the R/C except for the tip. The idea of putting a $20 tip on a $10 top kind of rubs me the wrong way, but if try to forget that and ask myself "Would I pay $30 for the resulting top?" the answer is "Oh yeah, I certainly would!"
Have Fun,
Tom