20x20 to 16x16 mm adapter for FC/ESC

Since the space between 20x20 and 16x16 mount holes is very tight, I used this to fit a 16x16 ESC to a 20x20 copter.

Print in TPU. This is fairly critical, although you can probably use glue instead with PLA etc.

Place on the 20x20 mounting holes and push a M2x6 screw through the mounting hole and into the outer hole until the adapter sits flush. This takes a bit of force and is intentional.
Place ESC/FC on the inner holes and push either a M2x4 screw through from above, or cut the thread