Converting the Sectional Didge into a Tuneable Didgibone

Here is an easy way to convert an ABS sectional didge into a tuneable didgibone, like a slide trombone, hence the name. This involves removing the seating rim inside an ABS connector, so that the smaller pipe is free to slide in and out: 

In the above diagram, section 3 becomes the sliding pipe. If you cut section 3 to a length of 22 inches then you have a sliding didge that goes from the key of C up to the key of F.

At the moment I am leaving the slide section with a very tight fit, so that it doesn't shift around once it is the length you want. For slide didge effects it would be necessary to sand down the inside of the connector further so that section 3 can slide more freely. I haven't done that yet because I am mainly interested in having a didge that can quicky change key, and that stays in place when the required key is found. Once you have used a tuner to establish the key lengths you can etch a marker line onto the outside of the pipe.

My sectional didge in D toots an F. An interesting advantage of the sectional didgibone is that when you increase the length of the sliding pipe to 31 inches you can set the key to D and find yourself tooting in D as well. This is the first ABS didge I've ever made that can actually toot (or trumpet play) the same key note (an octave up), at least for the key of D. The second toot is an F# which also falls happily into the key of D. I have tried for a long time to get an ABS didge that toots the same note (an octave up) as the basic drone.