How to tap 80/20 10 Series extruded aluminum 

Are you building a camper van or working on another engineering project using 80/20 10 Series extruded aluminum and want to use hidden end fasteners? Here is how to use a hand tap to add a 1/4 20 thread into the end of your 80/20 10 Series extruded aluminum.
You can also clamp your aluminum to your workbench for tapping. If you have soft pad clamps (like Irwin brand) you may not need to protect your aluminum. If you have a metal bench clamp, use a couple scraps of cardboard or cloth between the clamp and your aluminum to protect it from scratches.
8020.net
80/20 10 Series smooth profile w 4 T-slots - part 1010-S
80/20 Standard End Fastener - 10 Series - part 3381
dewalt.com
DeWALT Adjustable Tap Handle - DWA141TH
DeWALT Tap and Drill Bit - DWA1410