When I installed mine, I had few problems. The biggest one was cramming in the "holder" extrusion, the T-shaped one, in the main gasket's groove. But it really wasn't a big deal at all.
However, I did do some prep work that probably few people do. Because I bought my gasket ~2 years before I used it, it sat in a box for a LONG time. About 3 weeks before my install, I got a clamp and hung the extrusions full-length. This was during summer, and as you can tell by my location, the gaskets got good'n'warm all during that time that they were hanging.
When it was time to install, they lost their "memory" of being packaged, and installed no problemo.
My $0.02.
Bill
