I just completed installing one on my Win 70. We removed about 3/4 of an inch of stock and ground the pad to fit. There was (ahem) a lot of grinding. It was nice to have a buddy with a stationary belt sander (that little oscillating model from Home Depot)
Because we only had medium grit belts we were a couple of hours of very carefully sanding and test fitting, a 60 or 80 grit belt to start would have made it faster.
Bottom line, comfy pad installed, looks pretty good. And no, we did not use a jig, hand held all the way.
Take your time, be patient and careful and you'll get good results.
