I recently puchased a Belkin "light up" keyboard but was a little dismayed to discover that the little legs that you normally use to adjust the tilt of the keyboard have not been included in the design. Since I hate typing on a flat keyboard I decided to make a semi-adjustable "lifter" to reduce my increase my comfort.

Step 1: Requirements and Getting Started

You will need:

1 Mountain bike inner tube
Cable Ties
Puncture repair kit (optional)

Measure the length of your keyboard and cut the inner tube slightly longer making sure you have the valve in the length of tube to be used, exact measurements aren't needed, I just laid the inner tube over the keyboard and then added a few inches.

Step 2: Sealing the Ends

bunch up then ends of the tube you have just cut and then tighted a couple of cable ties around the bunch a few inches back from the open end.

(Optional)
Clean the inside of the tube and run some glue from the puncture repair kit around the inside where the cable ties will grip it, to give a good seal. Personally I've not needed to do this as the friction seal from the cable ties sees to be doing just fine.

Step 3: Finishing Off and Improvements

Pump some air into the length of tube and test for leaks by placing each end in a bowl of water and looking for bubbles. If you DO have air escaping make sure the cable ties are as tight as you can get them and/or add another cable tie to the leaking end.

Once you are sure the seal is good, take the short lenth of tube sticking out from the cable ties and fold it back on itself to hide the ties. This is alot easier if you deflate the tube first.

Place the tube under the rear of your keyboard and adjust the air pressure until you have a comfortable tilt.

Improvements.
I will probably replace the air with sand as that should improve the "moldability" of the lifter without having to mess around getting the air pressure exact, and I'll be able to use a length of tube without the valve.