He would have had to drill the 55 piston. Losi calls there pistons 55, 56, 57 etc. but they are all 3 hole pistons (and don't fit in academy shocks, just a hair too big.) and he stated a 2 hole. I believe that Associated #1 pistons are 2x55 holes.
I have only run associated pistons so far mostly from Dave A.'s suggestion plus just my familiarity with the associated piston sizes.
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Team MRC/Academy USA
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