Spent a lot of time doing reaasearch and just plain ole head scratchin on this..... decided to use 3' long angle with plumb bob's as many have done before. Seems to have worked out but I won't knwo for sure untill she goes onto the gear upright. Anyway the best part of the whole process was "Titanium Drill Bits".. We ahve jsut expanded our selection at the store to include these.... right on time for my project... Super bits plus Boellube..... No Problem...Oh and gonna use all "Grove" stuff... Gear, Wheels and Brakes...