Posted for "Pat and Sue Brunner" <n98pb@sbcglobal.net>:

 Jim
 Your magneto story seems about right.  I just had my magnetos redone
 with the 500 hour inspection after finding a perfect right magneto but a
 wet and rusting left magneto.  With close inspection it appeared that
 the left magneto has about a 1 to 1.5"  gap in the pressure seal along
 the bottom edge.  Both are working fine now but I believe that the
 replacement of the filter element should be done on a regularly
 scheduled basis, at least annually.  My filter "looked" good and was not
 replaced until I discovered the wet magneto.  I had been in some heavy
 rain about 6 months before this discovery but not since.  Can't really
 figure out how the moister is entering as the magneto's are pressurized
 and should preclude entry from a leaking pressure seal.  Maybe this is a
 result of moisture entering on cool down, as in condensation with a
 leaking seal.  I know that I will be watching them closely in the
 future.  BTW I have found a source for the filters at a fair discount to
 the TCM part.  With shipping and handling they are running about $42.00.
 
 Here's wishing you the best of luck with TCM.  Keep us informed at to
 how they are handling the issue and thanks for the update.
 Pat Brunner
 N98PB LNC4/570 hours.