Setting an accurate depth of cut on a router bit is a fussy task. Precise routing usually takes some test cuts, unless you have a depth gauge. Rather than buy a commercial option though, I figured I could make a better one myself.
Spacer blocks have a number of uses, from setting blade height at the table saw to positioning the fence at the router table. Here, Phil shows how you can also use them to precisely set up the depth stop on your plunge router.