I seriously doubt there dozens of folks that want the canceling feature, let alone "hundreds" .... one style here, NOS or rebuilt .... or look for a Grote like this

you want modern tech, there's dozens of add on modules on e-bay, units like this use "vintage" appearing units - for electronic gizmos for canceling, any motorcycle shop can supply them, early Harley owners need them grin

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