Trade? I figured you guys got all the yoyos you wanted for free
Not much though. Weight distribution matters a lot more. It’s still important, but If it’s within 61-67 it’s not as important. Extremes will matter though
I really like 55-63g best 
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Bearing is 2g, axle is 0.7g, pads are 0.3g. Assuming all standard materials and standard sizes, nothing exotic.