What carpenters call the 'snick factor' – the satisfying engagement of the lock as a well-hung door is pulled shut.
I can relate to this on quite an intimate level. Yesterday I fitted a new door frame and hung a door for my son's room, carefully balancing it to cut in for the hinges, chiselling the hole for the latch and accurately fitting the latch plate - then pulling it shut for the first time. A perfect rattle-free click shut. I had my snick factor.
However...
Today the carpet was fitted in the room. Ever helpful, I had removed the door to give the fitter easy access. But when I re-hung it the carpet was so thick that the door dragged across it and grinding obscenely on the metal edging. The door wouldn't come within 30cm of closing.
I was snickless. Bereft of snick. Snickered.
I think I need a writerly equivalent. Something to describe the satisfying engagement of words with mind as well-honed prose is read. In case it ever happens.