kj, sit the LA on the engine mount and move it forwards or backwards to get the best position for CG balance. Then the 2 metal straps fit over the side flanges of the engine and are bolted to the mount. You are not supposed to get the holes on the engine flange to match the holes on the mount. Although this seems a 'Heath Robinson' affair to mount th engine it works, I have seen crashes where the plane has gone in nose first and the engine mount has absorbed some of the force of the impact saving the firewall from being ripped from the fuze.