The difference in metric thread pitches isn’t too difficult to fathom, especially if you own a thread pitch gauge set, which is very inexpensive to buy. There is normally a choice of only two threads for each size and not surprisingly the rule is that the larger the size, the greater the pitch. Choosing the correct spanner or socket size could not be simpler.
I was actually brought up on Imperial measurements and have a whole range of spanners and sockets (I was bought an Imperial socket set for my 18th birthday) but certainly far prefer metric.
Thread drift warning! I was also brought up “pre-decimal” currency and had to convert. I was doing a paper round in my teens when decimal currency came in. I used to have to collect the week’s money on Saturday mornings and on the weekend of the changeover I had to collect cash in £ and give change in decimal currency. Explaining that to many older folk was an interesting experience. One old lady told me: “This decimal money will never catch on round here!”
Built like a gun... could go BANG!
