Basic procedure is to ensure the connecting rod length is correct. Adjust the threaded clevis so that both brake shoes contact drum surface simultaneously. Accomplishing this in reality means disconnecting the rod, and then finding the point in the travel of each brake arm where the shoes are applying equal pressure. Then, with your third hand, adjust the spacing between the clevis's so that the pin is a slip fit.
This will just get you a basic slowing/stopping device. If you really want to get something out of the TLS you need to radius the shoes to the drum, and install the stiffening plate.
Here's a good resource:
http://victorylibrary.com/brit/2LS-c.htm#adjustment