the bow packaging should state which bow you got...look for it to make sure 30/40 is what you got. read the manual it should of came with, find out how many turns on the limbs bolts are too many, than findan allen wrench and turn the bolts all the way in(getting the poundage up all the way to 40), once you have that done than you can start to back them out according to instructions in the manual. make sure each limb gets equal turns..if you follow the instructions you should be able to do it safely.