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Gudgeon pins usually become a tight fit if a machining burr around the circlip groove is dragged in with the pin, or if the pin isn't pushed in squarely. Once the pin hole in the piston is marked, the pin will always be tight. You need to use a tubular dummy pin to hold the small end rollers & washers in place and in the absence of a proper gudgeon pin tool a long bolt with a plastic washer behind the nut to draw the pin into place might work. minor scratching around the gudgeon pin hole is commonplace due to the difficulty of installing the circlips if done with a pair of thin nose pliers, and shouldn't be a problem.
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