[Blender]

The MIP CVD losi axle where it goes into the coupler is 2.40-2.62mm diameter. It's a bit smaller near each end and largest at the center. Must have deflected while MIP machined it. 2.5mm nominal. That's the bummer since i made my couplers 3mm to fit the MRC parts

For comparison the losi LMT18 axle is less consistent diameter in the same region which was my main reasoning for not using them despite being less expensive.