Product review (5 stars): This was surprisingly easy to replace
This was surprisingly easy to replace. I followed the instructions in this video: https://www.youtube.com/watch?v=xp5sV_1SSKw

The old door seal had ripped and leaked for years. I tried patching it with Sugru and bathroom caulk, which kinda worked -- but not that well.

I finally bit the bullet and replaced the entire seal. I thought it would take longer, but it only took about 30 minutes. I was worried about replacing the spring seals -- inner and outer -- but they were surprisingly easy to remove and not too much trouble to put back on. It's much like putting a bike tire back on after fixing a flat -- i just jimmied it around with a couple of flathead screwdrivers. At one point I asked my wife to hold the outer spring in place to stop it slipping, and it was a breeze after that.

There's no need for the expensive spring openers that are sold with this.