I expect that in a good rolling boil, the bag will be kept moving around pretty good and not burn...having never tried it though, I can't say for sure.It will probably sit on the bottom and burn im guessing.
I just bought a PVC reducer, drilled three equidistant holes around the perimeter of the wider section, and attached three threaded rods with nuts and washers. I also put nuts and washers at the end of two of the rods, which help keep the rig centered, and can be adjusted to fit different pots. The paint-strainer is fed through from the bottom, folded over the top and held securely with a large hose clamp.Blind is there a DIY that you followed? $5 is cheap and i got the time, im laid off