I just changed out the impeller on my 2016 Merc 60hp and have been unable to get the shift shaft to align with the lower unit. I have tried shifting into forward and reverse making sure the lower unit was also set the same. I was able to put it back together shifting into neutral and setting the lower unit to neutral but it must have been a little off because I could not shift all the way into reverse. Is there a trick to doing this when it won't align properly? Any help would be appreciated.