I thought you’d like to see some pictures of how I tightened up this standard Enco ratcheting arbor press. As it comes from Enco, the bolts in the front and the side press against the ram to tighten it up against the casting and prevent slop. The problem is that it doesn’t work that well — it tends to be either too loose or too tight.
Here’s my press with the front plate removed. Notice the brass-colored smear on the front of the ram.
As you can see, there’s a hollow in the front plate…
… which allows you to insert a brass shim (I think this one is 1/8″ thick) that’ll provide slightly better sliding contact with the ram.
There’s no pocket on the side though.
So instead I drilled out the ends of the side bolts and pressed in brass rod. You could also use bronze or plastic instead of brass, or you could just insert plugs ahead of the bolts. This modification allows you to adjust out most of the play in the ram while still allowing it to slide in the casting.