[Jockeyshift41]

Hello fellas. New here to the Ford Barn. I’ve been rebuilding a few carbs for a 2x2 intake I’m swapping into my 52 F2. One carb had the idle air screws modified with a groove cut down the entire length. Never seen this before in my 35 years as a mechanic. Was wondering if this was some old shade tree mechanic’s trick to lean out carb due to no access for parts or what? Anyone seen this before or know why? Good thing I have an abundance of parts.