We just recently bought a new kit and was surprised by the thin blue thrust ring that came with kit. I just recently got back into rocketry because of my daughter after about 27 years. So far this is her third kit and first I ever seen such a thin thrust block. We just purchased a 2157 Saturn v, 7234 crossbow sst and 3232 centuri, two of those had thick green thrust block, but the 3232 centuri has this cheap blue thrust block also. Is this becoming the new standards of estes thrust blocks are do I have two kits with wrong Thrust block. I plan on replacing the cheap blocks with a thicker thrust ring if this blue ring is what they expect us to use. Might even change the 1921 Redstone to a 24mm engine mount.