What size bit do y'all use to cut out feeder holes out of outer covers? What do you plug them with when you are not feeding?
You may want to check out those Caplugs or the T-240 STOCKCAPSIf its a migratory top? The purpose for it is to keep the bees in when Moving them. Drilling holes in them is not wise, simple things to use for your need of top feeding a empty deep place the feeder on the top bars and place cover on. And don't drill holes in your equitment.