New felt bootoms just replaced
HCR,
Just replaced felt soles on my old Orvis chest waders. As previously suggested, stuff the toes very tightly with newspaper before proceeding. I used a double stone grinder to remove all the old felt from the bottoms of the boots. As you stated, mine also have a heel on them that's not on the same level as the rest of the sole. I did as suggested and cut pieces to fit the sole by placing the new felt to the bottom of the boots and cutting off the new felt to fit that area. As also stated, put a couple of coats of glue on the felt and boots and let them dry for the time suggested on the glue tube. Placed the new felt on the heels and soles and wound duct tape around the boot as tight as I could get it. Let dry for about two days and then took off duct tape and trimmed the overlapping felt to fit the boots. Seems to have worked out well. Now, if we ever get any rain in the streams I'll be able to try them out!
***NOTE OF CAUTION*** I'd be very careful when you touch the new felt pieces to the bottom of the boots. I slightly misaligned one of the heel pieces and couldn't hardly move it into the correct alignment as the glue set up almost immediatelty.