Works every time!I remember your old trick but not the complaints from the complainypants contrarians. If somebody decided I needed to screw the double wall to my stove then I would certainly try to replicate your procedure instead of the alternatives which really don't exist or are hacks.
Now for single wall pipe it's easy. And to agree with BeGreen I would drill holes in the stove collar if none were predrilled from the factory.
There’s always some people around here that don’t agree with altering anything, wether it’s the pipe or the stove. I’ve learned to keep some solutions to myself because of it.