Hi All,
On My 61 SR which has the brake cable anchor on with the torque arm and downwards pointing drum lever,
on these models the brake cable length does not alter with wheel movement, as the brake plate rotates when the wheel is adjusted.
This is different to the earlier wheel where the cable anchor is cast onto the brake plate
I reworked the cam lever angle by adding steel wrap arounds to the brake shoes, this brought the arm to work at
as near + - 90 deg to the cable
Then I shortened the cable inner and outer to get it as near straight as possible
while ensuring the crossover lever was working at its most efficient angle, + & - 90 deg
The brake now works and will even squeal the rear tyre if needed
HTH
John