All the compliments offered apply; terrific paint finish and all.............arbor presses are under appreciated, their rams beat by clumsy apprentices with steel hammers, handles bent with cheater pipes, never lubed...... This detracts nothing from the work so far, but there are so many improvements [for this or most of our equipment] completely within scope of a home shop.
Yes, at same time I'm a thorn in the side of less than full usability.
Paint is no issue, a great reminder to use things with care. Cart mounted too, I fully understand all the restrictions imposed by walls.
1] The mount location is less than optimum. Notice it's 'feet', underside toward front of base. That is the normal protrusion from edge, allowing increased sizes from underneath; like pressing an axle bearing, while the wheel flange doesn't impede alignment. Whatever tonnage, the extension's casting has sufficient reinforcement.
2] I don't know why a stop clamp isn't standard equipment with arbor presses. Easily made for square arbors, round identical, just a different approach. Depending on tooth size [pitch] measure that spacing over 2 rods at least 1 tooth apart. Deduct one diameter, that's center-to-center distance, of 3 pitches in this case. Use cap or hex screws, long enough so threads don't land in teeth. Make a 2 piece clamp [milled if square, bored if round] large enough for a vertical stop adjustment screw. This enables work like building a nesting fixture, keeping pins at equal height.
3] You'll get good use adding the slotted platen as suggested in post #12. For $100 bucks though, better off turning out your own, probably 4 at that price and rolled not cast material. Measure throat from the pin hole back for diameter, and pin forward to arbor centerline. Widest slot just bigger that in base, intermediates all your choice, or research common sizes offered. Largest possible diameter will need a small chamfer underneath to clear fillet where table meets upright. Drill those center locations, saw or mill out remainder.
Many users have a fixture plate as well; rectangular by depth and width of choice, retained by 2 SHCS [socket head cap screw] counterbored below flush. Flat head, not best choice. Great in shaft straightening, not juggling V blocks and part; without sprouting added appendages. Not to mention wardrobe issues, lol.
4] During heavy use, casters might be troublesome, locking trucks might help. The best combo of maneuverability switches out front two for equal height stand-offs. Add two removable or extendable wheelbarrow type handles, usually tubing within tubing. Roll out when and where needed, steer back into it's minimum parking spot.
5] Well yes, of course there are more!