Didn't post in the forum for ages but here I'm back with a question:
My newly acquired Yamaha 642 gives me real trouble with the slides. Especially the main slide and 3rd slide just keep coming out slowly while playing. I tried the Yamaha grease that came with the instrument, as well as la tromba grease and now JM no. 7 slide gel. With the gel on, it feels pretty tight but the slides keep coming out anyways. Any remedies known?