AMuzi wrote:

No. They are American SAE 60-degree thread.

p.s. You need a set of thread gauges:
http://toolguyd.com/blog/wp-content/...itch-Gauge.jpg

I have one, but only for Metric 60 and
Whitworth 55.

The Whitworth 55 24G blade looks like a very
good fit to the crank thread but having it
perpendicular and holding the crank and
thread gauge to a light bulb I do see some
light shining thru so perhaps that's it?

BTW why are the Japanese and Chinese/Taiwanese
using a US system? Not that there is anything
wrong with that! Only the English system is
everywhere I can understand because of them
pioneering manufacture/industrialism...

--
underground experts united
http://user.it.uu.se/~embe8573