quadcopter 22xx to 1806 motor adapter 2204 2205

I bought some cheap diatone X frames (polycarbonate type)
they only had holes for 22xx motors, not 1806, so made these adapter for fitting 1806 motors.
Would also work upside down, to fit 22xx motors to a frame drilled for 1806 I guess!

22xx motor bolt spacing = 16/19mm
1806 motor bolt spacing = 12/16mm

2mm (M2) bolts for the 1806
3mm (M3) bolts for the 22xx

thickness below bolt head is 2.5mm (so a 8mm bolt will have 5.5mm thread showing, which is usually ok for frames with 3mm thic