Maybe wanting to try out his new BFH.What safe measure ? was it worn ? Wrong size? What made decide that has to be changed out?
I've never replaced one. And that's starting with a 56 Chevy belair, and a 55 GMC and onward through the 70's.
It has shoulder on it right? There is probably some special tooling / procedure to remove it, as it's in a Aluminum case.
There hardened steel.