I personally like the R31 setup for the handbrake and such.
Once lubed up and functioning correctly it is far simpler and smaller than any other system I've researched.
Granted, the internal expanding shoe ala Bluebird etc. is what I would call the ultimate, but space is at a premium on a 510 rear hub so it is difficult to achieve without some serious design changes.
Mind you I have managed to fit an internal shoe park brake
vented rear disc onto a 510/610 rear control arm.
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Hand brake A1.jpg [ 75.65 KiB | Viewed 525 times ]
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Rear disc A1.JPG [ 129.05 KiB | Viewed 525 times ]
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Rear disc A5.JPG [ 125.24 KiB | Viewed 525 times ]
Intended for my PL510 racecar
One day, one day