Photographs of real wired plugs.
The black plastic is a slightly flexible type, which will reduce the chances of breakage if the plug is dropped.
This plug is made from a much harder white plastic, which is more likely to fracture if the plug is dropped.
The fuse carrier simply prys out using a small screwdriver.
If a plug like this is damaged, the only option is to cut the plug off and fit another one. The removed plug should be physically destroyed to avoid it being plugged in - which would be a serious hazard.
This example is a lead from a kettle, the other end has a moulded IEC60320 C15 connector. If the plug on a lead like this is damaged, it is easier and cheaper to replace the whole thing, rather than fitting a new plug on one end.
The fuse holder is fixed vertically, and is made from a red colour plastic.