I need help! 2011 175 TX with a 60 hp 4 stroke Mercury that is almost frozen on the spindle that’s it turns on. I have it completely unhooked from everything and it takes two hands on the motor to break it loose to turn it. It doesn’t matter where you stop, when I go to move it again, it’s stuck! I have pumped two different kinds of grease through this thing with no change. It seems to me that the entire shaft isn’t getting greased. The new grease only comes out in one place at the top of the tube, nothing at the bottom. It’s like there’s a direct line from the grease fitting to this place at the top. I think the tube needs to be cleaned out but how? Would heating up the tube soften up the grease inside where it would be forced out when pumping in new?