The bushings in my press kept coming loose - about every 75 rounds I'd have to remember to check all to make sure they were tight.
I called Hornady and asked about what can be done to tighten the bushing (that holds the dies, etc) in the press. I was told the O-rings are probably worn and they will replace them. They did (very appreciative of that) but that didn't solve the problem. So I looked into other options. I found the best thing was to add another thinner o-ring to take up the slack. I tried thicker o-rings, but nothing but a special order would get me something that might work. Since I've got 100's of them for doing automotive A/C work I experimented.
If you add this o-ring, then the bushings don't come loose and are not too tight where you need pliers to remove/install them
This o-ring can be bought at automotive supply stores - mine were 75 cents ea.
Part numbers (all the same o-ring, different vendors):
407085
MT0271
24085
It is a 20mm o-ring used on Audi/VW/Mitsubishi cars.
Hopefully this will help others with a similar issue. It is very nice to not have the powder dispenser, bullet seating die, etc come loose and pause the whole reloading process!!
Dan