Originally Posted by
mazdaspeed
I have the home made setup and I found it difficult to keep centered. What I've been doing recently, though, is using a copper/brass or whatever it is fitting from the home made setup to hammer each cup in individually. I find that slowly tapping around the fitting in a circle gets the headset in quite easily and quickly, you just have to be careful to not jam it in lopsided, and for that reason to be careful initially until it's going in straight and you can hit it harder.
Believe it or not, I have a headset press (Park) and this can still be a problem. Over the years, I've installed headsets with a hammer and a block of wood, the homemade press and the Park press, and no matter which tool you use, you have to pay attention to what you're doing. All three can put the cups in crooked if you don't take your time and watch.