I have a problem, I hope someone on here has a good and practical solution, that won't involve too much pain. I have recently been loaned a Baritone for a few months for some orchestral work I am doing (discussed elsewhere). Unfortunately it seems whoever had the instrument before me had not been told that tuning slides need to be moved occasionally, and they are stuck... rigid... solid, won't budge an inch. The main slide works, and i have cleaned this and greased it so it moves fine now, but the three valve tuning slides are stuck, fully in (as though they have never been moved. I've tried washing up liquid, but there is no gap for the liquid to get into the slides. I've tried soaking the instrument in warm and cold water, but nothing helped. I've even tried tapping gently with a hammer (through a cloth and bit of wood) but they'd not budge at all. Any bright ideas? Any of you instrument repairers? Cheers.