Get a spring that has a larger internal diameter than the outside of the drill bit. Place the spring on the drill bit before you begin to drill. If you are level when drilling, the spring will not move on the bit. If the spring moves towards the drilling surface or the drill, the angle can be corrected to make the drill more level.
YoozMasterMaster
When drilling horizontally, place a spring on a drill bit to know if you are drilling level
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