I switched out my f62 to a new modern case offered on the website and I do enjoy it -- However, the process of taking it apart has brought me a lot of grief- save yourself the hassle that I'm going through and do not disassemble your keyboard if you don't have to!
I have been following the guide & videos posted on ellipse's youtube channel and website, but the instructions are pretty dense and hard to follow
I think my keycaps need to be reseated as the feel isn't consistent between them and the sound is off -- I adjusted the voltage via the software and still no dice on getting all of the keys registered.
I will revisit this soon, but here is a photo of the carolina blue modern case for f62!
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Looks great. I have had keys start acting up, especially on the bottom row, when pulling the whole plate sandwich out of a case before, with F ATs, my F XT, and my F77. I think it only happens when I do quite a bit of manhandling. You'll get the hang of reseating/tweaking them quickly.
I just took my F77 home this past weekend to resolve the few keys that were buzzing, and lubed the spacebar stabilizer, since I have always had dielectric grease just lying around anyway.
I know you've probably seen it before, but the emphasis on reseating the keys with all of the legends upside-down (with the board resting squarely on the side from which the cable comes out) is very important. If that doesn't work after a few tries with your problem keys, I found that using a needlenose pliers to reach at least halfway down the barrel, grabbing the spring, and pressing it as straight down onto the little nub it is attached to on the flapper (about as low as you can go without kinking the spring) usually solves the problem for me, otherwise Ellipse has also mentioned removing the spring, and reversing it. I have been able to do this entirely with needlenose pliers as well, there's at least one awesome recent guide involving plastic tube and bamboo skewers.
Are the keys that aren't registering also ones that sound/feel weird? I would worry about tackling those with physical means first. I have had plenty of capacitive buckling spring flappers refuse to register until the cap/spring orientation was just right.