This has been getting a lot of hits, so clearly, it’s a common problem! If this advice helps you, or does not help you, I’d appreciate it if you could leave a comment so I can see if the instructions need to be clearer (ie, more pictures and whatnot).
This is 100% unrelated to anything else on this blog, but I am submitting it on the off chance that my recent experience can help someone else out there. Like a public service announcement! I did a few Google searches to help me solve this problem and the web was full of bad advice, although eventually I did find the right solution, which I present below.