the lad looks to have an armature connected to the top of the front beam that turns as the bag 'lifts' upwards... turning the armature and in turn
the torsion leaves 'up'.
looks pretty heavy duty too.
I'd imagine if you got bags, you wouldn't have torsion leaves any more and would probably have a solid state bar inside or something to 'twist'
the torsion arms around via the bags themselves. I dunno.... but yea. enjoy:
http://cgi.ebay.com.au/Volkswagen-1300-1966-Beetle-Deluxe-AIR-BAGGED-/3205642...
This has been on eBay for yonks now- started at 19k!
Looks pretty sweet though- would be a fun cruiser!