Drilled alignment hole in both gear legs and mounts. Fitted gear mounts and bolted into place. Lots of work. Had to open up holes in F972 to fit. Also, had to use a AN4-13 bolt in place of AN4-12 bolts in tow places, the inside of the lower gear mount that bolt up to the F904A. Plus had to use thinner washers (416L's instead of 416's) where I bolted in the AN4-12's along the F904 at the top. Took a lot longer to put in the gear mounts than I thought it would but it's done!!!