I could talk for hours about the good ol' shop days... truly some of the best years of my life...
Way back in the early days of my VW career, I made a switch from a small specialty shop to a large production shop. It was great money for the time and we stayed real busy.
Anyway the motor man, (I'll keep his name out of this--Rayburn knows him

) could build air cooled VW engines faster than anybody I've ever seen! He could also do comebacks faster then anybody!! It was not unusual to have a "fresh rebuilt engine" come back in a day or so on the hook with something wrong, sometimes catastrophic, and he would usually get the thing back to the customer the same day! I would guess he had a 10-20% failure rate...
The best part about this guy, he could not explain how an engine worked... not even basic theory!
Pretty amazing... this guy did this for decades.
FWIW, he was a real nice guy... I guess that has to count for something

~DR.