A taper pin is self-locking. That means the taper is shallow enough so
that when you bang it in with a hammer or press it in with an arbor
press (or a drill press, for small pins), it won't come out.

Small Parts (www.smallparts.com) and MSC (www.mscdirect.com) sell them.
You need a tapered reamer to make the mating hole. A "taper pin
reamer", not a "repairman's tapered reamer".

Doug