I've noticed these BKey keyboards don't seem to be that reliable as time goes on. Having a faulty connect in a single key can lead to a missing row in the matrix. I've found this so annoying that I'm considering a project to create something I dub the 'reBKey A400' utilizing the original keycaps . I have it drawn in CAD, and have yet to mill the PCB.....so hold onto that dead BKey (or maybe sell?). BTW....if anybody should happen to read this, I'm looking for a "1 key' that is missing on my BKey. Anybody?