Audiofriends:
Hello Leslie,
Well, globally there are about 5 methods:
This is good Fred, with your permission, I will post this in a Wiki about refoaming on the new forum, will check for spelling and send to you for revision and OK, before publishing.
I'm still for shimming 
Beosound 3000, BL 4000, BL 8000, BG 2404,BG 5000, BG CD50, Beocord 5000, BM 901, BM 2400, BM 4000, BV S45, BV 3702. There is nothing we cannot do, but a lot of things we don't want to do!!