I added a caster wheel to my bale pickup when I got it, then added the single acting cylinder in order to shake the bale onto the cross conveyer when one sticks in the chute. To make the cylinder single acting, just put a breather cap on the port not being pressurized. You can get them at TSC, etc. If the bales don't want to walk smoothly across the 1st table, those on the main (2nd table) may not be pushed on far enough. Adjust the first table lift link to have them pushed on further. Be careful not to go too far in case the 2nd table lift interferes with and hits it. I also added a 1x4x 5' board to the first table rack up front with cable ties. This also helps push the bales onto the 2nd table a bit further and also does not interfere with the rack lifting. Having well formed bales contributes to smooth operation of the stacker. This means square shape (no bananas), tighly packed (not flimsy), and smooth edges (sharp cutoff knives). Having the right ground speed and pto rpm is important, too. The manual suggests optimum values....