I just repositioned mine yesterday. You remove the wiper linkage from the motor, turn the wipers on and let it run for a couple of seconds , turn them off so the motor is in the park position then put the wipers where you want them to stop and put the linkage arm back on the motor. The trouble I was having was they would park at the bottom for a second or two then jump up 6 inches and stop there, and this has been happening for 5 years and finally decided to try and fix it. It's raining now and went out , turned them on watched them for 5 mins on the delay. It was awesome to see them stop at the bottom every time. I guess it doesn't take much to make me happy!
2007 Allegro 34wa .WH w20 8.1 6speed. Bow tie powered 79 CJ7 or a 2014 Jeep Unlimited Rubicon Toad.