The BMX brake lever features a lock button, serving as a quite good "parking brake"
The special trigger controls designed for the ASC hub are even rarer than the hubs, so I took this 1950s "3 or 4 speed" trigger apart and ground off part of the escapement cam to make it work properly with the ASC.

Photos made with Nikon Coolpix 2500, minor tweaking with Adobe Photoshop CS2 9.0
August 24, 2005
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