Tom is asking about how to adjust the threaded support posts, item 60 here
While I think Geo & John are talking about the main adjustment, item 50.
It seems odd that this was never documented, but I've never found where it was. What I did to adjust the posts was to remove the drums and adjust until the shoes were parallel to each other. I don't think there should be any clearance (the shoes still rest on the posts even when the brakes are applied); but I'm not convinced that applying the handbrake will necessarily move them out all the way. But I don't think that adjustment is critical at all, so it wouldn't hurt to try your method (with no clearance).
PS, the posts were only used on a fairly small range of cars, TS15332 through approx TS56376 according to the SPC. My last two TRs didn't have them, but back in the 70s I had TS42xxx which did. TS39781 should have had them, but someone had replaced them with 9" brakes before I got the car.