Just rebuilt my 59 Evinrude Lark 35hp. Since I'm at it I thought I'd replace the water pump. Removed all bolts and the best I can do is get the lower unit to drop an inch or two. Seems the shift linkage rod is hanging up. Most lower unit's I've worked on have come come loose after a shake or two. I understand that with this model that you have to have it in the forward gear position which facilitates easier removal. Still having trouble. Help Please!