I know what you mean... as soon as Heuer was hyphenated, it all went down the drain.
I spent nearly 500 hours doing dive construction/demolition with an old regulator, not quite as old as the Mistral, that had a sticky mechanism. Sometimes I'd be working hard and suddenly the ball and spring would stick and I'd be sucking for air with everything I had. I finally grew a brain and some disassembly, cleaning and readjusting fixed it, and the next 500 hours were smooth as Miss Understood's butt.
The joys of "vintage" diving!