I am looking for recommendations for reliable suppliers of service kits for the full range of valved brass band instruments. I've recently serviced my father-in-law's Sovereign 955 baritone and my son's Sovereign 921 cornet but I'm having difficulty in obtaining service kits for a few Sovereign 950 tenor horns that are next on my list. I'd prefer to buy a complete kit (guides, springs, felts etc.) rather than buy each item individually. Many thanks in anticipation.