Tony Duell wrote:
The thread
pitch and diameter of the worm drive is different. That
actually matters, since the more expensive adjustables can be rebuilt.
You mean there are some you can't get parts for. I guess those are the
sort of tools I wouldn't consider owning.
Exactly.
You also
can't use a metric crescent on SAE nuts.
One of my adjustables (yes, I do admit to owning one :-)) has a scale
along the boddy with a line on the moving jaw. This gives the jaw
opening, of course. I've only ever seen them calibrated in mm (which
makes it a 'metric adjustable spanner', I guess...)
I had a '69 Triumph T100C - single-carb 500cc twin - that was SAE on
body parts, metric on engine peripherals and drive-train, and the engine
itself was all Whitworth. I spent more on tools than I did on parts
with that bike.
I used my 4" Snap-On crscent a lot, too. :\
Doc