if you're wanting to replace the mast jacket only, you'll have to remove it from the rest of the assembly - see the diagram further along Tims link .... best done off the truck

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