Woody

Okay, I need some good information on adaptor sleeves. I’m seeing them everywhere, and I’ve got to learn how to install and take off.  I’m finding they’re easy enough to put on. I’ve taken an adaptor off, but completely melted and mangled the plastic part. I realize they have a particular OD so no problem, but frankly I’m scared of the darn things. How do you get them off without melting? Are some all aluminum? Maybe they’re not made to take off unless necessary. Everybody weigh in!
thanks

~Bill

Woody comment on answer ago