For all us vertically challenged people( you couldn't drill a 90° hole if your life depended on it) I found an old craftsman drill guide in really rough shape(ok, ok it was thrown in a box and buried in storage) anyway, a good overnight soak in vinager removed most of the rust and loosened the spindle.cleaned up and oiled it has a new life! Seeing as I fulltime in a RV and storage is a premium(wife has too much stuff) this baby is perfect for tuning pegs. I found a place online for similar items(cheap) Click here or Google drill guides.
No only but also, I forgot that I was once vertically and horizontally challenged.
Drilling the holes for the threaded inserts that received the bolts that hold the necks to the body of my acoustic guitars, had to be straight, here was my solution some years ago.
I bought a smaller bench top drill press and mounted it so it drilled horizontally. Straight holes every time, two in each neck heal. Just shown as a matter of interest, you don't need it in CBG land.
Pretty ingenious really, whatever works!
Now that ingenuity.