The old one looks like it was made of neoprene foam. It has shrunk a little and I can see daylight at the corners. Any ideas on type brand and source for a replacement? Also what is a good adhesive for this job? I know this probably belongs in Ask Mac Owners but then I might miss Ross's sage advice.After that through hole informational posting I don't want to run off to Home Depot half cocked.Enjoyed reading that by the way.Thanks,Frank