I don't know about hadleys, never had any, but have pressed in many dozen bearings in various engines, hubs, BB, etc etc. One thing I do is freeze the bearing so it "shrinks" a bit and then use the old bearing or a large washer, to push on the outside diameter of the bearing (if you press on the inside of the bearing you run the risk of ruinining the bearing). The freezing/shrinking maks the bearing easier to go in sometimes it might just drop in or push in easy with your fingers. make sure it isn't going crooked. I've also used a 3/8" htreaded rod and apropriate sized washers and nuts on each end and tighten the nuts. Good luck with that!!.