I have a second question regarding the cable adjuster lug half way down the girder fork.
On the WM 20 there are two round castings, the one closest to the fork leg is blanked and the outer one is drilled and threaded for the cable adjuster.
I have a M20'girdermwhere both rounds are drilled and threaded, as for two cables.
I know early M series bikes had a cable / rod combination, meeting at that lug point, but that does not explain the use of two lugs.
Some prewar bsa have system to connect the rear brake with a cable to the front brake .at the lug are 2 sleeves instead of 1 screwed in to make the connection between front and rear..not many people liked this conversion 😁
I was thinking side car brake, but this makes more sense.
This fork came of a WM20, but I was sure it was not original.
Spares pulled from premwar stock I think.
It will go to my 27 empire star project, but I will not use the feature.
Funny, my Honda 1100 blackbird had the same concept using hydraulics, something like a 33 application to rear brake when you apply the front brake.
Worked great for a sports tourer, but was a serious limitation on burn outs!
But that was some years ago, when I was yonger and still needed lots of adrenaline in my diet!
Dual front brake rod, operated by foot pedal and control lever was introduced in 1927 as an option.
Last used in 35 the lugs are possibly a left over from then.
