Sorry for jumping in but I was talking to my dad who raced back in the 50s He said that rellinng the brakes was common. Most of the euro cars ran allum. drums, and I think that is where Nissan got the designs from. I looked at an old set and they dont look that hard to do. I think some people need to look for some of the old school or vintage people to see if anyone would still be able to do this. He noted that there was a lot of crative materials used back then to "improve" the drums. Remember they ran drums on the F1 cars at close to 200mph and they worked just fine. As long as SCCA allows you to refurbish them I see an opertunity to improve the originals. While it may not be the most inexpensive route if you can inprove the performane of you old drums it might be worth the cost??? If someone came out with a "HOT" drum setup for the Z car it might sell to the steet guys also this might get some people intrested in a larger production run and lower cost? Just a thought.