Thanks Edward, the wheel is aluminium, 120mm diameter (4-1/2”) It came with a 12mm centre hole, so I drilled it out to 14mm, then drilled the side of the boss, and tapped an M6 thread to take the original lock screw and nut from the crank handle.
It works well, the table needs a little lift with my other hand whilst cranking, for elevating. That could be from the extra weight of the additional table though? Lowering is easy, just the one hand.
I would like to source a steel wheel, and I think up to 5” diameter would be ok, depending on the table design.
The thing with a 4” to 4-1/2” wheel though, would allow for a deeper table to wrap around the pillar more.
I worked out how big I needed my table to be before starting, and it’s so far been more than big enough.
I was going to use the table from my old press but, it needed a fair bit of modifying, so I decided to just start from scratch but, glad I did now.