There was only one minor thing about it: The cable!
So I decided to turn my new keyboard into a wireless one.
First I examined if my favourite Wireless Keyboard Controller board (Logitech Wii) would fit, and which batteries I would need, then I started my mod.
It's really simple, and not very much work (although it seems a lot of work).
This is what you need:
- Filco Majestouch-2 Tenkeyless keyboard.
- Logitech keyboard for Wii.
This keyboard contains a really ideal wireless keyboard controller:
2.4 GHz (very responsive, no latency like the old 27Mhz ones)
very small (so it will fit in almost any keyboard)
also tenkeyful-support
low power consumption (my previously modded keyboard's AAA batteries still last after 636 days of intensive usage)
easily solderable
cheap (I bought some for only EUR 8,50 (=12 bucks))
- Duracell 9V battery (contains 6 AAAA cells, we only need 2 of them)
Due to the keyboard's compactness there's not much space left, AAA batteries won't fit, that's why I chose AAAA batteries.
With its 500 mAh I think these batteries will last for at least one year or so.
- Some small wires
- Rosin core solder
Tools required:
- Soldering iron
- Desoldering pump
This is how I did it:

1. Removed old matrix (desoldering pump required).

2. Added new matrix

3. Opened 9V battery

(contains 6 concatenated AAAA cells, which is ideal for soldering)

4. Watch the polarity. It's different than it seems. The flat end is positive, the tip is negative!

5. Added wireless controllerboard & batteries.

6. Finished!
(shamelessly cross-posted from geekhack...)