I'm going to need a drill guide for making the mounting holes for the spar plate. These are the ten bolt holes that hold the spar to the aluminum tongue. Since the drawing for the wing mounting plate doesn't have the bolt spacing dimensions shown, I had to measure the original one. These bolt holes were drilled during assembly but it appears that they had some sort of external jig to guide their drill. The spacing for the bolt holes for the top and the bottom tongues are both the same, but the spacing isn't the same between all the holes. Most of the spacing are 75 mm but they vary from 73 mm to as much as 83 mm. I suspect that the lightening slots were machined into the tongue after the bolt holes were drilled. I've measured the spacing and had my son draw them up on Solidworks for me. This is the Solidworks program that is available for free to all EAA members. Since it had finally warmed up today (above freezing) I took the planer outside and shaved down the wing root block and landing gear block to match the width of the spar caps. It was great to get outside again. It's hasn't been warmer than -20C for the past week.