Need help with an old Briggs and Stratton

[Benton]

I forget the brand, but years ago I was gifted an ancient push mower. First thing I did was try and tune it up, and found the filter was pretty much just gas-smelling dirt. I took the case to a local Mom&Pop Hardware Store and they helped me match up the closest one, suggesting I trim off any excess.

I used that mower for a good six or seven years before I wrapped a metal cable around the blade and seized the mower.

Short version: find something too big and trim it.