score the inside of the reel, not absolutely necessary but helps the epoxy to adhere better.
mix a little bit of epoxy, put a drop on the scored area and spread in a circular motion. place a zinc washer on and wait 30 minutes or so. the first reel I magged I used 3 washers and 5 neodynium mags. It was way too much. Went down to 3 mags. Then later on, only used 2 mags. Never had another birds nest again.
the epoxy will take several hours to cure, but sticky enough to hold the washer and mags in place. I keep a few mags with my little maintenance bag in case i need to retune while fishing. These reels are easy enough to remove the left side plate and add or remove a mag.