I have the same problem with the linkage arms, after setting the height adjustment to 0 I move the control for the linkage arms/3 ph forward to lower them and I reach up and essentially pull them down. After that, getting the shaft on I find very easy, from the left side of the tractor I lay on my side holding on to the handle on the fender, pull the collar back and "probe" the shaft to be sure it is lined up, rotating it slightly to be sure that it is and it slides right on, I also put a little grease on it. Be sure that you get the shaft connected before making any other connection between the MMM and tractor.