I got my son an Alpine Micro compound bow for xmas. They retail for $300.00 new, but I picked this one up on Ebay in new condition. It looks really good. Yesterday, he was playing with it and it came apart. The string worked its way off the top cam. He didn't dry-fire it, he just drew it back and slowly released it when he said the string "stung" his fingers. The string is now off to the side of the cam. It's a 40 lb. model and I can probably squeeze it enough to put the string back on, but I'll have the local shop do it with a bow press so I don't break it. I'll be calling Alpine Archery, but I wondered if any of you had an idea why this happened and how to prevent it from happening again.