I want to put this trolling motor on my aluminum pro crappie tracker. The one that comes with the boat is junk. My question for those who have one is this... can the shaft length be adjust on the Xi5 SW 55 with a 54 inch shaft? I known they make a 48 inch shaft but wanted some flexibility. I thought I read where it can be shorten by simply sliding the shaft up on the yoke. If so how much play is there. Thanks