Newbie - cleaning on a new to me v13 - the ways are rusty but smooth. Maybe I should say they are stained? I have been working on them with white scotch right and 0000 steel wool. Applied some way oil. Seem better. However the carriage continues to be hard to move back and forth. I was curious, is there a way to change tension on the carriage? Or possibly a lock that may be tightened for transport or something? I struggle to move the carriage with one hand on the wheel?