Drill guides for when holes end up slanted. How to use, choose, and precautions for the SK11 SGK-6

Even if you don't have a drill press, there is a tool called a "drill guide" that makes it easier to drill straight holes ...
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Companion DIY Drill Guide

A long time ago, in an issue far, far away…the May 2014 issue of KITPLANES, to be exact…The Home Shop Machinist covered the ins and outs of using the Quantum jig to DIY drill bolt heads for safety ...