I added the 5" scale length so you could zoom it to the right size, and took that picture from the template that came with my THDP years ago. However, I had to cut a good bit more off the cover to clear the pipe than that template shows, and so did most everyone I asked who used it, so don't be surprised if you need to trim some more. You can mask both sides with tape or even clamp thin sheet metal on for more protection before you cut and probably not hurt the coating on the sides, but of course you will expose bare metal where you cut so that will need paint or it will eventually rust. You could try a jigsaw with a very fine tooth blade but it will probably be running too fast and want to jump around and cause chips. Maybe your technique is better than mine, or you could try one of those router speed controls to slow it down. A hacksaw blade is wide enough that it doesn't want to follow the curve, but that's what I used, followed by a large round file to smooth it up. Not the prettiest but was ok. If you could get a very fine blade for a coping saw that would be great.
