Ok, so a long time ago when I was a member over at "Cast Boolits" a member there was making & selling docking stations for presses & lubersizers. I thought that it was a novel idea & checked his product closely. His docking station boasted of nice machine work but . . . the material was thin . . . to the point of customers having to shim the base of it or it would "rack". It became apparent that due to close tolerances if the unit wasn't shimmed perfectly flat then the docking plate that mounted on the press/lubersizer may not slide into the dock. Also there were no set screws to lock the press into the dock. Maybe none were needed? This is my speculation only mind you. So, I decided to make one out of heavier stock that didn't need to be shimmed. Also with more room for the press/lubersizer plate to slide into the dock AND set screws to lock it in. That was a number of years ago. Mine has been used heavily . . . and it shows as the paint is chipping/wearing off. I have three lubersizers & three presses & all have a mounting plate that slides into my dock. Never & issue as it is built like a tank! I used hot rolled steel plate but 1/4" aluminum would work just as well. Here's some pics. Looks like I got a double.
If someone else had of done to me what I did to myself . . . I'd have killed him. Humility is an asset. Heh - heh.