I'm just sure I'm wrong Larry, but, it appears to me that the "failed" rim
of the old piston is smaller in width, and, the inner rim/ring of the old
piston is also narrower, than the new piston .... which, by the way, has
additional slots to hasten the mixing of the margarita contents faster ;>)

best of luck and may you have experiences to give you confidence in your
motor.

Bob Stevens

http://groups.msn.com/BobsPhotoShare
http://groups.yahoo.com/group/tiico

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