There was an engineer who used to work for us years back called John, and he left and went to work for one of the large rental companies.
He was always a bit 'strange', and we happened to be talking to his new boss one day, and he mentioned that he sent him out to look at a faulty VCR. The VCR in question was a Ferguson 3V35, made by JVC, and they had a common fault where the front loading mechanism used to strip gears. The cure was to replace the entire loading mechanism, and it was so common we used to keep them in stock, and I assume the much larger company did?. But not John, he spent all day doing a similar teeth rebuild, actually in the customers house!.
One job a day isn't really a satisfactory work rate!