variations - part of the shockcord could be line
You put the guy in the pole and push the pole out. The fairlead takes the uphaul/downhaul fitting with it as you push the pole out, so that the uphaul/downhaul is in the middle of the pole. You gybe with the pole on the mast, then undo pole from mast, twist 90 degrees to get the key fitting to slide to the other side of the fairlead, put new guy in pole and push pole out and clip on mast. An end for end system.
Only seen on older boats that have not been converted.
The uphaul typically is thin spectra going into the mast shortly below the jib stuff luff block, and into the boat to a cleat. Some people do not adjust at all and simply tie to an eye strap on the mast. I have also seen the topping lift cleated on the end of the pole.
The downhaul should be line with a shockcord takeup. You need a positive stop such that the pole can only lift slightly before the downhaul prevents it going any higher. You need a little slack to get the pole on the mast when the mast is bent more in heavy air..... You may wish to raise the pole on runs, so you either need enough slack in the downhaul to allow that, or a way of adjusting the downhaul.
I use a Z-spar fork end, with a pin-removed conventional Z-spar end on the mast. Works quite well, but the pole launcher might make it easier to get the spinnaker pole on the mast after heavy air gybes.