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What's most important is that the gears spin 100% as freely as possible. It's okay to be off that .05mm since only marui ever made a .05mm shim lol
It's better to be a tiny bit loose than a tiny bit too tight!
Also, if the shimming was off on the bevel, you wouldn't be able to get the motor height set properly, if you've done enough motor height adjustments you'll easily be able to hear if you can't get the height set right. The advantage to shimming the pinion/bevel first is guaranteeing you can adjust into the right spot on the bevel. But I've only ever had to go back into 2 mechboxes of the hundred or so I've shimmed to re-adjust the bevel height. really narrow gearsets in really wide mechboxes lol
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