RE: Weird screw sizes
G'day Bill. I agree. I used to restore old Land Rovers. Series I were all BSF for which you needed Whitworth spanners. Series II came along and the body and engine went to UNF but the rest of the drive train was still BSF. Then came Series III and they left the body, engine and the gearbox the same but added metric to the brakes. AAAAAAAAGH! Three sets of spanners for one vehicle. And the wiring was all Lucas. And I forgot the BA series small nuts and bolts that held small things like the electrical connections. They stayed right through but you could not buy them anywhere.
Q "Why did Lucas make a vacuum cleaner?"
A "Because they wanted to make at least one product which didn't suck."
Q "Why do the British drink warm beer?
A "Because they have Lucas fridges."
Not fair really but they used to get a laugh on the Land Rover restoration boards.
And to get somewhere back near the topic - I have been trying to get a cylinder hold down bolt for a Saito 65. It is a metric 3.5 mm size and of course all the nut and bolt places round here do not have 3.5 mm bolts in high tension cap screw types and I am having problems getting the original spares out of the local agent. I was using a cheap Chinese ball driver to undo the bolt and the head of the ball driver broke off in the head of the bolt. I recently managed to get it out with some fine pliers and a small magnet.