Hello Tim, before you do anything, visit my website www.pizka.de/Corks.html and see how to replace them. I had used neoprene before, but they tend to swell if in contact with certain oils. So I changed back to the use of corks. Self cut corks are not any solution as it is hard to get them down to the right dimension, where 1/2 of a milimeter can influence playing. Send me your postal address & I shall send you two cork sticks, enough to change the corks twice - if you do it carefully. Do not forget wrapping the cork sticks into a thin towel, carefully hammering them to oval size, so you can insert them vertically in their sockets on the horn & then cut short. If the alignment (see the inner marks after descrewing the valve cap) is not at 100%, press the cork just a bit sidewards in with a metal instrument or a wooden instrument. That works.
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