MAKE A VARIABLE PITCH STRING INSTRUMENT USING A ROTATING WHEEL FOR KIDS OR ELDERS IN 3 NIGHTS.
Step 1: INTRODUCTION to a novel string instrument
Refer to that publication for all important details pertaining to construction, string tuning, and tools.
Also , information on stretchable strings as used for a Ukulele can be found in Mistic's Instructable 'How to make a miniuke' dated Jan.14,2010.
The difference here is the tuning and playing method improvement. A wheel or pulley stretches the 3 strings of plastic in a rotating fashion and the variation in tension changes the pitch of each string in a controlled fashion.
Refer to the figure for the Vari-Pitch instructable. It is played by pulling on the strings in a linear direction. The new variation changes the tensioning method by rotating the string around a pulley.