similar to Jon, but I use spray can expanding foam, spray it on the saran wrap, roll it up tight, press it against the area to be worked or something the desired shape, give it overnight to cure - provides a bit of give as well as any odd shape
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
