robj
70cc twin V2
I found that if I sanded the inside of the cowl with some 100 grit sandpaper or a dremel sanding drum ever so slightly that it fits much better. I had a few high spots in the fiberglass and once I smoothed it out it slipped on nicely. My wing tube was quite tight initially but after about 30 flights it loosened up a touch and fits snug, but easily now. Perfect.
This worked out fine. Mostly took the bumpys off the figerglass.