After all the pieces were cut, drilled, deburred and cleco'd it was time to weld. The (2) 1/8" plates had to be filed in order to fit around the weld. Only the tube is welded to the L channel, everything else is riveted together. AN470-5 rivets were used. The engine mount weighs about 2 pounds. A hole was drilled after the engine mount was centered/squared for a 3/16" quick release pin to make engine removal a relatively painless process.
