I have just finished fixing up a pair of kef 104/2.
Surprisingly straight forward if you choose the right model.
The donuts were a doddle.
As was replacing the tweeters with morel mdt29-4 from the states.
The only mod to the cabinet was removing a countersunk nut, drilling the hole slightly deeper, and reinserting the nut.
This is my third pair, and with the morels may be the best, though with 10 years covering the 3 pairs, who knows for sure.
They sound superb, and are a bargain at current prices.
With an onkyo a9010 they are excellent.
I have a Lentek integrated on it's way.
That will be very interesting as supposedly an excellent match for the kefs.
Definitely reccomended.