Has anyone here used the CalderPips grips with their euphonium?? Similar concept to the straps that Dave (and others here use)...but these are leather wrapped (and padded) cut steel...so more of a handle that your hand rests in (instead of a strap pulling on your hand). I just ordered one...I'll make sure and do a review once I receive it!
(they asked for several pictures and measurements to make sure they make it the right dimensions for you.)