maybe new tight felt channels would fix it, if you're replacing those when you pull it all apart, but it sounds like the regulator is worn - when you have it out for a look might be able to mash a rivet tighter on the regulator mechanism
"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
