I had originally machined some of the elevator trim nuts (WD-415) that attach to the E-616 trim plates but I machined the wrong angle in them. I was then forced to purchase new plates and nits so I purchased some from IFlyRV10 machined nuts and went about matching them to the E-616 plates. I dimpled the plate and machined countersunk the machined WD-415s. Then attached four nut plates to the back side of the nuts. I attached everything to the cables and elevator trim tabs and all matched very well.