Modify a brake drum from 58-62 or 63-72 to fit the original backing plate assembly. Then I will have cast iron drum instead of drawn steel.
Make a twin leading shoe brake with mainly HD-parts:
Modify the backing plate with aditional pivot stud and brake cam. I will have to modify the brake shoes to fit of course. This seems to be the easiest to do.
Modify front brake drum of 49-72 to fit the springer fork if this is bigger than the 36-48 brum. I will then have to make the backing plate myself.
Modify the rear brake assembly from 58-62 or 63-72 to fit the springer. The backing plate will have to be modified from hydraulic to mecanical operation.
Do anybody know the internal drum diameter and band width of the following HD's:
* front brake big twin 49-72
* rear brake big twin 58-62
* rear brake big twin 63-72
I'm also thankful for any comments on the ideas.