Barry, unfortunately, you have to loosen the first nut that holds the reel tray and remove the screw that holds the housing, lift up the tray about 1/2 inch, this will allow the transport unit to fit in, it attaches with the same two screws on the backwall and one on the left side front, no one puts the rear screw in. depending on the age of machine, that plate that holds and guides the cash can has to be removed, there were two types, one had a screw that held the plate in position, the other, the plate was tach welded into position. I remove the housing, drill out the four tach positions and remove the plate. Everything else is the same, again depending on the machine , some of the cash can switches were mounted to the right front wall, I usually break off the studs so the WBA cash can has a little more room to be inserted. the last thing is the bezel on the front door, don't panic if the bill guide on the transport doesn't align, I just cut away the plastic on both sides of the transport bill guide until it matches up with the door bezel. first one is a little trying, after that it goes pretty quick. I just completed one the other night, so I could send you pictures if you would like.
Jim