I’ve done it on the Mark 6 / Silent Six. Presume it’s the same idea.
It was no fun, and required a torch, pipe wrench, big vise, etc.
Frank, I didn’t know you could hear me swearing 1500 miles away!
I “think” the job can be done without removing the swivel tube,
but I like to do things the hard way, lol.
Prepare to be boarded!