bshaf

I had the same problem with my 37 in the Hawk Sport. Take the arm off the 37, use the lock washer that's under it. Use the bolt from the 37 with a washer, split lock washer through the arm that came with the Hawk, then put the lock washer that you took off in the first place between the arm and the throttle body. Thats how I have mine on, 3.5 gallons and still holding. I did order an upgrade arm from Heli World for the 37, just have not put it on yet.

They should send more than one arm for different engines, but.