it's a roll pin, and I've seen some of those on TF trucks that only come out one direction, won't go right through, as if the hole is tapered

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