Tool - Drill Block
Milescraft 1312 Drill Block
http://www.amazon.com/gp/product/B00F1ZJFZK/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1 $8.71
It keeps the drill bit perpendicular.
PL-Premium gluing the jig into a bigger wood base makes it more accurate.