Spent about an hour on the beast today, washed the valves and swabbed the casings with solvent and removed the lapping compound, washed and brushed the inside.
Oiled the valves, greased the slides and reassembled, checked valve alignment, not bad, have seen much more costly horns worse. Valves quite smooth in operation, springs stronger than I like but ok.
Playing, with Blackburn leadpipes from behind not much different from my old Selmer, supplied Bb leadpipe ok, A pipe no. would suggest new leadpipes, perhaps this is a new project.
Supplied mouthpiece a strange double cup design, similar to old Selmer, does work but not my choice.
Was this an exercise in futility? I will see when I return it to its owner on Saturday.
Regards, Stuart.