I finally decided to simply lube the stabs. I have dental bands out here because I know a dentist, but I am not really digging into this. The sound of this Norbauer case is really dark Thock. Recommended.
I still have to open my HHKB to use the mx white stems we bought from that GB, but I admit I am a little afraid as I really love that little piece of plastic... may be when there is a metal case approach that interest me I will take care of changing it all.