gchun

A couple of suggestions:
1. Map out your "plucking" pattern first. If in doubt, pull out less, then pull out a little bit more at a time. You can always use contact cement to glue back some of your "mistakes." Worse case, you can always buy new foam if you totally mess it up.

2. After time, usually years, the foam can either get gummy or start to flake. To avoid that, leave case open whenever possible to let the moisture dry out. Better yet, let it sit open in the sun. The moisture destroys the foam.

3. I've never had problems with the foam scratching the horn's plating, but if you are concerned, you can line the case with something like crushed velvet. Use some contact cement to hold it in place. The lining will also keep the foam from getting damaged.

Garry