Not really much of a project, but today I converted the HF 20 ton press to the air actuated jack. It was much easier than I was expecting...the old jack was held in place by a couple of maybe 8mm cap screws, so it came right out. The new base was of course different, so I match drilled two new through holes ( no interference with anything on the new part, fortunately) and it fit right in place. The ram screw bolt was a bit smaller than the old jack locating ring, so I made a thick delrin washer to position the new ram in place.
Note that this mod is a good step, but not quite as cool as expected. The air pump is pretty noisy, uses a lot of air, and is slower than I thought it would be. Yes, faster than by hand, but only by say 50%...and MUCH easier.
Overall, maybe I’d give it 7 out of 10, or so.