Used the Mark on the F-794B for first cutting, I thought that was what it ws for bot wasn't mentioned in the manual so got a confirmation from Van's. Used a dremal and a heavy cut off wheel. After fitting/triming a few times clamped it all down and marked the lower rear end of tthe F-794B to be cut so cut that off to fit. I then clamped it in place and marked where each hole shoud be drilled on the top of the HS and the sides of the VS, will use the find a hole tool to drill out all the places whre the screws will be with a #34 bit which will be drilled later with a 6/32 thread tap for the nutplates
