...I had to look on e-bay for a picture of the CN-1. I have never used one, but if yours no longer cuts all the way through housing, there's something wrong with it.
It's designed as a lower cost alternative, but with the same v shaped, bypass jaws that other wire cutters use to cut cables.
If you really don't use a cable cutter very much, It's possible you can get yours working better by tightening up the hinge bolt. There can't be any play in it.
But given your usage patterns, if you want to replace it, the people at Pedro's have a
relatively good quality alternative. Not as good as Felco or Knipex, but still more than adequate for sporadic use.
There are a lot of alternatives linked to that Amazon page, that are far better cutters than your old Park CN 1. A cable cutter that leaves raggedy ends is useless.