I guess maybe I am the last guy using a straight key screwed directly into the desk! For me, the issue is ergonomics. I am pretty sure most keys were designed to be used with the resting elbow and the base of the key on the same plane, but cannot prove it. Using a base an inch or so thick puts the key base in a different plane than the resting elbow. What I do know for certain is that when I first started using a key back in '76, I had the very same one I now use, but it was screwed into a bit of 2x4 which rested on the operating surface (which was actually our old kitchen table, with a nice formica top I didn't want to put holes in). The knob was too high and I rested my arm wrong, with the wrist bent. As a result I used to get "glass arm" after about ten or fifteen minutes of operating. When I set up my second station I screwed the key directly to the top of the cheap second-hand desk and the problem went away. The solution used by N1OOQ above would also work, as it puts the resting elbow in the same plane as the base of the key. Using a very thin base should also work ok. But if you find yourself getting "glass arm" or carpal tunnel syndrome, and your key base and elbow are not in the same plane when sending, try making the adjustment. I think you will find it helps a great deal.