Some hardware stores have a section in the fasteners aisle , with all those skinny little parts trays with all sorts of odds and ends and different bits and pieces of things. There should be one with a selection of stainless steel screen that are for replacing the ones in the aerator of your kitchen faucet. Some call it a diffuser. If those don't look like they will work, ask a clerk at the service counter. The smaller, full service hardware stores have stuff you may not know about or see. Some oil filters are made with a fine stainless steel mesh and can be ripped open, cleaned out and the mesh reused. Try using a paper hole punch to knock them out. McMaster-Carr is another place to look for it, will come in sheets, a life time supply for you and your flying buddies!
   Type at you later,
  Dan McEntee

Problem solved. Thanks to Dan I remembered a reusable coffee filter I bought many years ago at a grocery store. It has a very fine mesh screen that felt like stainless when I punched the hole out. I was using it to filter my batches of home brew fuel.