Infuriating and downright nasty. In other words, a stripped binding screw. Here's our basic how-to to solve the stripped screw snafu.
Stripped binding screws - Gear Talk
Information About Various Small Engine Carburetors and Fuel Systems
Information About Various Small Engine Carburetors and Fuel Systems
How to Remove a Stripped Screw 10 Ways
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Stripped binding screws - Gear Talk