Claudio (Rainman) fixes them. He fixed mine and told me what the problem is that actually causes them. The tubes end up with cracked resin because of people overtightening the screws, usually the front grip frame. When you do that, it pushes up into the lower tube, moves it, and cracks that resin. Claudio fixes them by adding a couple o-rings, and re-doing the resin. Why they didn't come with a couple o-rings in there to begin with is beyond me. I would recommend NOT using JBWeld. It doesn't tend to hold very well and mucks the body up. He doesn't charge much to fix them, and does a great job. Talk to him. You won't be sorry.