Those look really sweet! I'm surprised one of them broke - they do look way over-engineered. But then again, I wonder how many bottles they've capped in their time? I'd think about cutting a gasket to sit in the base so the bottles aren't resting right on the metal. Or maybe you could paint on some of that liquid silicone stuff that you can use to dip your tool handles in.
So that's your garage design showroom? What does your actual home garage look like? Either way, it's damn inspiring. Really nice!