My inlaws need a broken 2 prong T slot replaced. I have a replacement 2 prong outlet from Lowes (not a t slot). Their house has a 60 amp fuse box that has both the pull out bakelite fuse holders that hold cartrige fuses....and they also have edison fuses.As I have learned, the outlet I need to replace, can only be turned off by pulling one of the three bakelite fuse holders out, but that turns off all of the lights to the house. I have thought of trying to unscew each of the 4 edison fuses until the power to that outlet goes out.Question I have (before I try it) is if it's safe to just unscrew one edison fuse at a time, until the power to said outlet goes out, even though their may be other items on the same circuit in operation?Thanks in advance.