To withstand the strictly perpendicular direction when drilling holes in the wall or to any vertical surface— just attach to a drill with tape or duct tape carpenter’s level. His shifty air bubble in a glass tube, show that you have not rejected the tool from the horizontal.
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You can, of course, brush them, however this will not last long. More radical means of plastic washer embedded between the half-loops. There is another way to get rid of the squeak....