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This is one of the time delay fuses in the box outside by my a/c condensor unit:
New ones don't come with the copper end caps as far as I can tell:
I'm guessing they just get pried off the bad fuse and pressed onto the new fuse??
Yes, it appears these adapters are common.
Those adapters are used to adapt the smaller fuses to a 60 amp style fuse socket and yes they are removable and transferred.
Required, but never shown