We use some pressure putting the ferrule together so the edge of the sweat is flared out thus preventing your head from direct contact with the felt and prolonging sweat staining.
instead sew it in using the stitching holes of the tape to the sweat instead of sewing thru the reeding tape.
Fedora said:...What is odd to me, is I have seen loads of hats that contain a reeded sweat, but the hatter did not flange the sweat, and installed it without flanging the reed...