I remember a few decades ago when I worked in a mom & pop job shop, the owner (the old man as we called him) was very OCD and a real jackass. He looked upon his machines like they were classic cars or something. Anyway, there was a young apprentice who worked there that had about 3 months left on his apprenticeship. He was a very conscience worker that gave up a better paying job to get into this apprenticeship, as there were hard to get at the time. Chuck was a meek, mild mannered guy and kinda religious and really put his heart into everything he done.
He came to the break area one day, acting very out of character, fidgety and nervous, looking a little pale. I knew something was a miss, so when the other guys left the break table, I asked him what was wrong. He looked over his shoulder to make sure no one else was in hearing distance, then he told me. "I was drilling some holes in a set-up plate, and I accidentally drilled into the mill table. If the old man finds out, they'll carry me out in a body bag".
I could see why he was so nervous, the old man was very intimidating, and he not only feared for his job, but getting his journeyman's card as well.
I could see that the guilt was eating him up from the inside, so I offered to help him if I could. I strolled over by the mill and casually looked at the table without drawing too much attention to myself. On the pristine table top there was an 1/8" hole, about 1/4" deep, that just happened to be centered between the T slots. It was to the right side of the table, far enough out that a vise would not cover it.
As he told me, he was drilling a series of holes and broke a bit. He replaced the bit, but forgot to re-set the quill stop.
I came back to his work bench to see the fear in his eyes, and said "Relax......I got this".
I finished my lunch early, and went back and run a 6-32 tap in the hole, added a set screw, then stamped O-I-L around the screw.
The old man never caught on......