Dick,
Certainly good advice from some point but does it not concern all of *us* wasting time in various discussions in "forums" like this - in stead of playing ??? Another point is that knowledge about what you are actually up to while practising may add understanding of means and methods in a more profound way and facilitation of routines may offer so much more efficient practise that the "wasted" time actually is paid off with interest.An additional important issue is prevention of injuries and health problems from overuse. Music making actually is VERY exposed
to "occupational" distress.

Jack Campin,
I think I know what kind of material you mean.Like I said above , the difference between sax playing and concertina is that with the sax you want a fairly stable location in your mouth while with the concertinas a more flexible and varying position may make complete elasticity of the straps preferable. I use the same kind of material as for elastic braces and by choosing the width between 15 and 60 mm you may find exactly what is ideal for a specific instrument.