If I recall correctly they can be adjusted in the slots labeled a,b,c,d. That is if you have the model that i am thinking of.
them were 28,29,30,31 inch draw lengths I think.
The other way was to get a cable that was a little shorter. I think that bow has the metal teardrops on it. I would not go more than 1 inch shorter than manufacture string length.
Just an old memory its been a long time. I cant remember for sure.