Routing-Out-HDPE-End-Caps Published December 12, 2012 at 350 × 321 in How to Mark a Multi-sleeve Rolling Pin with a Box Router Jig Instead of a Lathe Use a trammel and straight bit to route out end caps from HDPE plastic, fit the trammel’s center pin in 1/4″ pilot holes, which you will use as holes for the rods.