as bobj said, you only need to raise the blade about 1 1/2 inches high. this height will determine the length of the kerf. i make my own inserts but dont measure the length or worry about the length of the kerf. i am not an expert, but if i were building a top and the insert i have been using worked fine, i think i would make the new top like the old one with regard to the kerf in the insert. it seems to me it would make building the new one easier.
ps, the only reason i can think of for the kerf being to one side or the other is the blade tilt and if its a right or left tilt saw.
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Last edited by levon; 01-01-2009 at 09:57 PM.