This is a custom-made Num-pad tilting block made of wood.

But there are pre-made of this kind, but they are very expensive.
But well worth the investment because of the less strain
on wrist and fore-arm work.

You can offcourse program it to do much much more!

Like: Using the Enter on the numpad, together with the numeric numpad (that also works as a keypad).
For example.
You want to change the diamter, you simply use your left hand to alter the values,
and then confirm the change with enter.
Supersimple, and superfast.

You work much more efficient this way (i believe)...

But whait this is even more.
With the other monitor (main monitor)
you can use a calculus program at the same time (not the same time as Moi3D)
but switch to another calculus, ex i use SpeedCrunch 0.12 which is an excellent calculator.
It has all the variations you put in it (with Num-Pad device) in the rows, so you can easy follow
if any value is off by 0,01 or more...

So i use the Num-Pad for both usages, both as a value-device, alterer i Moi3D
and as a speed-crunch number in the other monitor.
Very, very handy...