You are right Marco. A book COULD be written on the changes to the course, even the changes in the last 31years. Anyway, there is no way that the front wheel comes airborne at Ballaspur today, the reason for Milky's crash would probably be misjudgement at the "new" high speeds the riders travel at.In fairness to Milky, why don't we ask him what caused the accident? In 1975 Ballaspur was "flat out" on a TD2B, and it was a pretty good feeling to feel the front wheel lifting.
Anyway, on to Glen Audlyn. There was a super photo of John Surtees in the 1960 Senior TT taken at this spot. So it must have been "flattened out" around 1962, since if you hit the spot today in the way that J.S. was riding, you wouldn't land before Ramsey Docks.
What nobody has recognised is the fact that the bikes reach Glen Audlyn after Milntown doing about 150-160mph, whereas any British single from the early 60's would be travelling at about 100-110mph,and an Italian Multi about 10mph more than that. It's the same all the way round the course. Sections that were flattened out, still have the basic contour in the road, and now we're going 50mph faster, the same proportionate lift if taking place.