I have always used the 3/4" bolt with big washers and carefully tightened the nuts to install head sets. Sometimes the cups go in straight and sometimes you have to start over. I refused to pay the $100+ for the Park tool because I am cheap and in my opinion they made it waaaaay more complicated than it needs to be. Maybe its good for a shop that does a few headset a week, but for garage mechanics it would get used once in a blue moon and I could not justify the cost. So I have been doing some work with this guy and he gave me a 3D printer to make prototypes for him. I decided to make some headset press adapters. These ones were designed for semi-integrated cups and tapered head tube. They worked flawlessly. The cups pressed in like butter. Straight and square. I am going to make another set for standard straight 1-1/8" head tube with external cups.