http://www.dwerden.com/forum/showthr...s#.Yx_h_lNOlEE
Post #2 in that thread should point you towards new felts if you are interested. I originally bought those for my Schiller, then when I got my New Standard I took the felts from the Schiller and put them on the Besson, and they worked just fine.
Ultimately I may replace my metal guides with plastic ones as Dave mentioned, but the difference with just new springs and felts was enough that I am happy for now.
Good luck getting your horn fixed up!