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I've replaced both in the past. Was told by a rep and a dealer to replace the bottom only when using the Nomex white felt they were marketing for awhile as it was thicker. Rep said the gasket was for cushioning anyway. One dealer in my area assembles with bottom only, the other with both gaskets. So the mystery continues on this for me. One of my larges has been egging gasketless with no problems for about six months now and the other large is heading in that direction. Advice? Go without gaskets for awhile and see how she likes it. Just be careful when closing the dome.
Santa Clara, CA
"Where the weak grow strong and the strong grow great, Here's to "Down Home," the Old North State!"
Med & XL