I recieved the Martin Monsterbuck bow as a gift. I took it to my local bow expert/buddy know it all.. He says I need a longer draw length than I currently have. He says there is a part on one of the cams that is replaceable to increase draw lenght.. The part he is talking about on my bow has F-5 on it and is black plastic with two screws holding it in place.. Is there any truth to this? Can I increase the draw length? He says I need it to be around 30..

Any help would be appreciated!
THANKS...