i have a 1985 johnson 25hp model 25rcos .trying to drop lower unit to fix water in oil problem got all hardware off and have it separted a bit in two spots understand that i have to separte linkage under water vents.i have tried every thing on these two nuts but can,t get them to budge and it is getting to the point where the brass nut is starting to get round can anybody help me on this before a fire starts .ha .ha thanks