Not sure I follow.
Sound like you overtightened and cut the insulator. Best to check it.
Nom nit the one pointed at (arrow labeled for an adapter of some sort). Random photo. Just for the correct nomenclature.
Look at what's in the mod and it's obvious.
I would just loosen the screws a turn or two and slide the fuse out.
Took out the original 510. The insulator looked o.k.? (first pic) Went ahead and put the other 510 in.
Took the fuse out and looks no bueno, no mas.
Thanks for the help ST and HeiSINberg. I'll run up to the store tomorrow and stock up on fuses.