Need some advice on my knee mill conversion.

To fix up the poor repeatabilty issue by base flex im going to mount the lead screw and ball nut assembly onto the column.

However to take the weight of the table I need to add pneumatic setup to it.

Ive purchased a Grex100 BOB, I was just wondering what parts do I need to control the cylinders up and down movement.

Also what kind of cylinder do I need....Magnetic, Double action??? What electronics do I need...something Like a solenoid im gathering and what kind of solenoid. Ive read into some of the options like NC and NO....Any advice anyone can give would be fantastic.