Wrench and Socket Head sizes for the VMAR Bird Dog power module hardware are as follows:

For the Prop Nuts 7/32"

For the Power Module nuts (that fit on the four threaded studs that attach the firewall to fhe fuselage) 7/32" deep socket

For the four black machine screws that go through the firewall and thread into tapped holes in the motor mount (backing plate) 2.5mm Allen Wrench

For the 2 or 3 black grub screws that retain the motor into the backing plate are accessed via the slot between the motor the backing plate 1.5 mm Allen Wrench.