I've never noticed that and I've had multiple ones apart many times. My first one was one I got CHEAP off ebay, because it needed repair. That's when I found out the Thermoquad air door spring works perfect on them. It was a 625. I just put a 750 on my Ford truck and I think all the tuning it's gonna need is adjusting the accelerator pump and air screws. I don't see how they're a pain to disassemble at all. Just like a Thermoquad. You sure we're talkin about the same carburetor?