Thanks for the info Matt G. and Squatch. I done some research on parts tree since your posts, and found some interesting things. Matt is right about the 451, it uses a slower ratio gear set and same pulley diameter as the 450. The 551 uses the same gear ratio as the 450, but the pulley diameter is not listed, different part number, so probably larger diameter. My questions now are: If I install a 7" diameter pulley onto a 551, will the unit fit onto the 1912? Will I need the 448 kit as used by Squatch on the 1872? Thanks again guys, I really appreciate the help. Good info is always better than learning the hard/expensive way. Mike
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