You shouldn't have a problem cleaning the horn. I have a 67 Coprion Director cornet with an attachment on the 3rd slide, but I feel it is likely for a lyre only. It is not constructed as to be usable for tuning adjustment, in my opinion. Many cornets have extended slides to help with the problem notes. What I do is pull out the end maybe 1/2" and that really helps in "lipping" the pitches.