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When I bought 6 new JE forged pistons and lightweight wristpins back in '96 they were all the same weight right to the tenth of a gram.
I wouldn't settle for anything less, so I would send yours back to whoever you got them from and have them send a matched set of wrist pins... not just the weight but the alloy and wall thickness too.
Then get a closer matched set of pistons from him if possible too. It should be easy to remove/polish some metal in certain areas around the wrist pin boss to get them exact.
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