I'll try my best.
Let's say the spool is gone down to the blue.
You make a circle (like the ok sign) with your fingers. Take the line that is in front of you, make a U shape with it, feed the U tip in the finger loop. Attach the boltsnap to the tip of the loop and let it drop to the blue. Wait... the reel will be pulled up as the boltsnap drop. Then you have the dsmb at the surface, the spool in your hand and the bolt snap is down at the bottom of the sea.
I actually just clip the double ender on the line and shove it trough the circled fingers.
Make sense?