I just swapped out my stock impeller for a Solas 14-19. Its my first time doing an impeller change and it seemed to be pretty easy. I was wondering if there was a specified amount of clearance between the pump and wear ring. There seems to be almost none, but it spins freely. Also, is the grease in the pump anything special or will any marine grease work????? Waiting for wedge to show up before install.