Originally Posted by jefnvk

Easy to make at home. Get a copper pipe a bit narrower than your headset, take a hack saw and cut an X into one end, pull the "petals" outwards. $4 and works exactly like the far more expensive Park Tool option.

For press fit installation, a 2' section of threaded rod, a couple fender washers, and some nuts, and you effectively have the same tool Park sells for about $8 total.