This thing focuses HARD. When I mean hard it means that I have to put almost all my strength into doing it. I'm getting tired of it. Does anyone know how to get to the mechanism so that I can clean/lube it? And what should I use to lube the thing in the first place? ANY advice would be appreciated...I can't seem to find anything on the 'net, but if someone could point me in the right direction that would also be appreciated.