Denis is in England, he has installed the Saturn on many tubas there. They have to be slightly modified for tubas, he includes an instruction sheet for your repair tech. Just follow the links at the bottom of the page, or do a search for "Wedgwood Trumpets". Knee's doing real good, I'm 2 weeks post-op, got 6-8 weeks of physical therapy looking at me, but I've been there before and know the drill. Real nice to get rid of that pain! Best of luck with the water key mission!