& on the starter battery connection some models used the delightful "Lucas thread"!
That was the brilliantly engineered thread that always stopped working when it rained, right ?
No, that would be the solder lug that connected to it, but that's another story!
Most of the Lucas starters used a so-called "Bendix screw" system to engage with the ring gear.
Oh boy! Did they ever get screwed by Bendix!
The damn thing would jam in contact with the ring gear ----- sometimes you could get it to unjam without removing it, but other times, you had to take the starter out.
As this usually happened when you were not in a nice neat workshop, the Lucas nut on the connecting lead would fall down, bounce around in the"guts" of the engine compartment, & skitter off somewhere in the dirt.
A newbie would just think it was either a Whitworth, BSF, or UNF nut & go sifting through their junkbox, trying one nut after another.
None would work, so it was back to grovelling atound on the ground till you found it.
To add insult to injury, some of their models of starter
did use normal UNF threads!
They were like Forrest Gump's "box of chocolates" ----you never knew what you would get!