To the guy who suggested dumping them, that's laughable. These speakers are a total classic and sound incredible.
Tubeking, Orange County Speaker is exactly who I went to, they had the complete kit: surrounds, center doughnuts, adhesive, instructions and brushes.
The speakers came apart pretty easily, I labeled all the wires and foam positions for reassembly.
Once I got the drivers out, 2 of the 4 woofers had holes in them about the size of a dime... this was the source of my bass loss.
The surrounds were as brittle as a burned piece of paper. The slightest pinch broke it apart. I pinched my way around the surround until it was off, then took a pocket knife to the outer edge to remove all the gunk. I tried a razor, fingernail, and a few other tools but the knife was by far the best.
The inside surround came off very easily with a fingernail.
Be careful, these things will damage easily.
For the doughnut, tilt the driver so none of the old surround can get in the voice coil and use compressed air to make sure nothing gets in there, this old foam is like gum when its compressed. I used my fingernail very carefully here to get all the stuff off.
First I glued the inside of the outer surround, let it dry, then the outside and at the same time the doughnut.
Check carefully that the voice coil is aligned well --> no scraping!
With patience, this was very satisfying work.
I changed my terminals while I was in there and put everything back together.
WHOO HOO!!! My KEF's are back... bass is snappy and tight, deep, just like they used to sound. REALLY glad I did this and would highly recommend to anyone with a pair of 107's!