My Q-40 motor was removed and the other motor mount and Thunder Tiger Pro 40 (TT) were test fitted.

I ended up adding a 1/32" thickness piece of plywood behind the TT mount to bring the spinner farther forward.

Some epoxy was added on the surface of the firewall, spacer, and back of the motor mount.

The motor mount was then attached using 6 x 32 bolts. Some 6 x 32 bolts were installed on the front beams of the motor mount.

Fiberglass cloth and epoxy were mixed and applied to the front motor mount beams.

Apply fiberglass cloth and epoxy at the seam where the firewall attaches to the fuselage.