There is an adjustable (flimsy) plastic piece that pulls out so you can punch using half the holes, flip, then punch again

Each piece of paper gets stuck and ruins the whole insert for me

There is an adjustable (flimsy) plastic piece that pulls out so you can punch using half the holes, flip, then punch again

I must have done something, maybe knocked off a stray piece of plastic, but now it seems to work fine

I went to try and punch a piece of paper and it wouldn't let me slide one side all the way in, turns out there's glob of metal along the flat edge to put the edge of your paper against