yes they're self cancelling - you've prolly got broken/missing springs, or the peg on the cancelling plate is missing/broken .... parts are available, used can be found as well once you open'er up and see what's what ... pics here, half way down

Bill


Moved over to the Passing Lane

"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