I have this door latch in some of my old wardrobes. It's really difficult for my wife to open and really loud when it opens or closes - the spring seems really strong, it's not just in need of an oil. I want to replace it with something else - a simple handle and some kind of latch - a small setup, not large door handles like for room doors. Not sure what though.

I measured the plate thingy where the little round thing comes out. From memory it was something like 54mm top to bottom, whereas my internal doors have a plate that's something like 58mm high. I figure I go to the hardware store to find something else, but if I need to make that hole in the side of the door bigger how do I do that? Chisel? Some kind of saw? I have a jigsaw is all.

Thoughts or suggestions welcome.