I recommend putting stove jacks as high up as possible. It keeps the stove pipe vertical and exposes more of it inside to radiate heat.
Stove jacks are easy, cheap to make. A few sheets of fiberglass from the auto parts store, a tube of high temperature silicone mixed ~50:50 by volume. Do this outside, fumes suck. Smear it with a wide putty knife.
I've sewn mine with Kevlar fishing line in a Speedy Stitcher, but a sewing machine and nylon thread, works, I haven't done that, and nylons slippery. I may try using some of the silicone to glue it and get my wife to sew it, then use that mix to seal seams....
