Mega Mosquito Build Part 2, Engine Mount

The BT-50H engine mount tube was marked for the centering rings and engine hook notch.

TIP: Notice the centering ring marks are to the side of the engine hook. I've learned not to make all the marks in one line.
If all the pencil marks were in line the centering ring positions would be covered up when the engine hook is set in the slot.

I cut the finger tab off the engine hook and flipped it over so the sharp 90 degree bend would be at the bottom. The cut finger tab side is now at the top of the engine mount.

The engine will slide in easier with the sharp corners filed down a bit.

The 50/80 centering rings wouldn't slide over the BT-50H engine mount tube.
The interior holes were opened up a little with some 220 grit wrapped around a finger.

Here's a dry fit of the mount and center fin tab.
I didn't butt the centering rings tight against the fin tab.
A slight space was left in case the engine mount was a little high or too low.