What leeches were you using. I presume they are Simms. If you had the old "S" shaped ones I'd agree that they didn't last too long. The newer ones are called Super Leeches (I think) and are the same as those used for crossbows. These work much better as far as durability is concerned, but can still fly out of the string. It's best to have the string twisted pretty tight or serve them in just like you would a peep. On the other hand, good old Cat Whiskers are pretty hard to beat for price and function. They slow a bow down a bit more, but this is just one of those issues you have to weigh. What's more important, a few fps or quiet? For hunting I'll take quiet every time.