I just purchased an Excalibur 440. The kit that came with mine had a rope stringer that attaches to the limbs. I tried pulling back to cock the string and can barely budge it (even an inch). I noticed that Excalibur and others have a string aid with small pulleys on each side that attach directly to the string. One of the strings attaches around the back of the crossbow and has 2 handles to use for leverage. Has anyone had success using this to cock and un-cock their 440? $200 for a crank seems a little pricey for my blood and I was hoping I could save some cash. Thanks for any advice!