A small story
Just a small story to highlight how something so small can make such a difference.
I had a new composite door fitted a while back, and I was incredibly pleased with it, until one day the locking mechanism would not work. Unfortunately for me, I was on the outside of my house, and the door would not lock, and would not open, and my back door was locked with the key in the door! I was on my way to a meeting that I needed to attend, so had to leave it. A locksmith came out late that night, as I was out of hours for the door manufacturer, with the total confidence he would get me in through my door ‘in a jiffy’ Nope! He really tried, but was worried about ruining the door. I was stranded.
The manufacturer sent their guy out the following day, with difficulty, he opened the door, stripped, cleaned and oiled the mechanism – bingo, it worked…for one day! He came out again baffled, and as he started to take the mechanism out again, noticed a loose very small screw, less than (I’m guessing here) 0.01% of the entire mechanism of the door, causing the fault!