Hi,Everyone! I'm sort of an exacting type guy when it comes to rebuilding an engine and I've looked all over the net for a chart that would tell me how close the piston assembly of the Polini kit I ordered should match the weight of the old piston I'm replacing,percentage- wise.(piston,pin,clips,and rings).I know it's pretty critical on Automobile engines,but I don't want to drill or add weight unnecessarily.I haven't received the kit yet,just planning ahead.I own a refrigerant scale which measures to 1/4oz. and a gunpowder scale which measures EXTREMELY accurate up to 2 oz.Would a postage scale work?Just as a guess I wouldn't think it would be too critical on a one cyl.engine that fires every stroke,but I'd like to hear from Fred,Ree,Ron,Jim C.,Jamie,Doug D., or someone who might know the tolerance allowed.The Franco-Morini runs so smooth now I'm sure I'd be really dissatisfied if I pick up a vibration when I install the new top-end.Thanks for any info....I just couldn't come up with any and was probably looking in the wrong place.