best to take it off - it's a taper fit, gets siezed in over the years - leave the nut on so you don't bugger the threads and take the BFH to it, a shot of WD40 or such can help, but once it breaks loose it just lifts off, then cinching the nut on pulls it back tight

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 & Rust-a-holics Unanimous parking lot