Hi I sent in one mp40 for repairs since it kept falling off the glass. Well it is still doing the same thing. You put a new pin spacer sticker on rebuilt the wet side with a new magnet shaft also, the sticker is squished down and you can see how it gradually slides off as it loses alignment. The other mp40 does the same thing also. Today I will try the new wet side on the older pump. Any thougts? It seems to happen more often when I turn down the flow at night to constant slow. The tank has 1/2 inch glass and the spacer is set correctly, 5/8 has been tried also with similar results.
Rob
Rob