D.I.Y. KEY CHANGE WHEEL.
For not much more than a little bit of fiddling, you can make a Key Change Wheel.
1. You will need something appropriate e.g. cardboard. I have used an old, thin cutting board. Cut 2 circles, one a bit smaller than the other. These are 'pinned' together through their centres. How you do this is up to you, but the circles need to twist around the centres. I have cut a small washer to fit between the circles and pinned the lot together with a pop rivet.
2. Mark out 12 equal divisions from the centre of the joined circles. These will be 30 degrees each, like the number- spacing on a clock.
3. Using something appropriate (like a permanent marker) mark each division (in a clockwise direction on both inner and outer circles) with the following; C C# D Eb E F F# G Ab A Bb B (and back to C)
The final result should look something like the photos below. The inner circle has a diameter of 6cm. The outer circle is 9 cms.
This allows you to change keys by aligning the original key name with the proposed new key name. Then it is used in the same way as the chart. The important thing is to remember which circle you are using as the 'Original Key' It can be either, but you must be consistent!
With a bit of practice it is quite easy. These pics show how to make the wheel.
This last pic shows the wheel set up to change keys from 'F' (outer circle) to "G' (inner circle).