That's what I figured (having never operated either), though you would have to allow the double-ender to twist in your hand. I suppose that's probably not a problem if you're ascending at a safe rate.
You just clip one end with the line flowing through it (don't wrap the line, just let it go through one end of the boltsnap) then grab the shaft and use it as a handle to wind up the line. You don't put the bolt snap through the hole (the axle on deployment is your finger).
---------- Post added October 4th, 2013 at 03:51 AM ----------
SCUBA: SMB Deployment - YouTube