cool slingshot Iresh. I have pretty much the same slingshot but without the aiming device. I did find that keep the bands even helped a whole lot as well. just before my band broke I started pulling the band back right in front of me up to my nose. I'll shift over to my right side, steady up, and let it fly. managed to hit another marble at 20 feet a couple times. at almost full extended it'll turn on if the marbles to glass dust!
sucks about PA!