Hi All:
   I think that felt might be a good long term solution, with some
   precautions:

   1.  Use Moth-Proofed Wool felt.  Wool has proven to last many
   decades in a pipe organ when used for bumpers and sealing surfaces.
   Moths like wool, hence the proofing of it.  We use tons of this
   stuff in valves seats, both under cabretta leather and bare,
   depending on the use.  Avoid the synthetic stuff - it is not
   durable.

   2.  Get a felt that is really compliant.  Hard felt will not have
   enough "cush" to let the entire gasket get at least some contact.
   This may take some experimenting to get right.  I would bet that
   the foam used originally has a different force/deflection curve
   than felt, so you are really redesigning the assembly.

   3.  The flap spring rates might need to be changed to offer more
   positive compression - test and see.

   Places to buy:
   McMaster-Carr
   Organ Supply Industries

   "So good luck with all that......"
   -- Kip

Randy Bergum
1990 Carat
Fullerton, CA
************************

If we're "talkin" about the same parts, the hinged flaps allow forced
air (when van is moving) to come in via the fresh air ram up front.

Btw, I had read of one guy using felt instead of foam. Not sure if
this is longer lasting, (it may well be) but just tossing that idea in
for consideration.

;^)

Neil.