take pictures of each side of the cam - marking the cable with tape. take a picture of the cable slide - marking the cable with tape and making sure the picture includes whether the string and cable cross above or below the slide. also, if your cam isn't marked - and its in the right place before you swap, mark your cam with a marker so you know when you've got it right again.

twisting the cable increases drawlength and poundage.

twisting the string decreases drawlength and poundage.

twisting the cable makes the same adjustment to the cam that untwisting the string makes and vice versa.

what kind of bow?