No5 question

[muffett.2008]

Demo and Tbone, my apologies, I was cracktesting some parts this morning, still thinking about these posts, so decided to pull the woodwork again and have another look. Still not obvious, but I applied some dye and lo and behold, with the help of an ultra voilet light I found the faintest Number, not visible by any other means. Bugger you win, I lose. Good to know though.