You basically loosen up or o the other hand you just dance

if by "loosen" you mean loosening the belt then just put a wrench on the nut in the center of the pulley and turn it to the left. its basically spring loaded.

BASICALLY YOU NEED TO REMOVE THE BUMPER ENOUGH TO LOOSEN THE SCREWS FROM THE BACK OF THE TAILIGHT ASSEMBLY TO SLIDE IT OUT THE BACK.

Basically, you tighten or loosen the tension rods. Doing so alters the tension on the head of the drum, either raising or lowering the pitch.

A dead knot is one that has lost its connection with the surrounding wood and so it can easily loosen and fall out. A dead timber knot is basically the same in timber wood.