I tried to adjust my valves over the weekend and could not manage to budge the rocker pivot nuts. I just couldn't get the leverage. The jam nuts were also very hard to budge, but I got them to move. Also, the pivot nuts are supposed to be 14mm, but the 14mm open end wrench was not a tight fit and I started to round off one of the jam nuts at which time I quit. Any tips on how to get the the pivot nuts and jam nuts to move, how to get more leverage, and how not to break anything while doing so?