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That's a version of the usual cave way of doing the spools. In a cave you might have 3 or 4 spools hanging out your back, so it makes sense to have an absolutely foolproof system of storing them without fearing them coming undone. Any method which does not pass the line through one of the spool holes will at some point unwind given the right situation. There is no way to adapt the cave spool method to an SMB (and by this I mean keeping the smb attached all the time). To use a method like this one you will need to undo the spool and attach the SMB at depth.
If the double-ender is clipped in the other way, the line on the spool will open the gate.
Tie a bowline knot at the clip-end of the line with about a 10-12" loop. Then tie an overhand knot at the end creating another loop... about 1-1.5" After rolling the line on your spool, run the line through one of the holes on your spool, attach the clip through the loop, wrap the line around the clip until it is fairly snug to the spool, then clip to the spool with the clip facing out. You have to use a double-ender clip.Could you describe this?
The gate will find a way to open itself up wether you put it on the outside or the inside, its just the nature of how much twist it's applied. That's why, the foolproof method is to pass the line THROUGH the hole as exemplified by the cave diver's method.
WhiteSands, I found a video that clearly demonstrates the best practices and still keeps the SMB attached. Is this what you were doing?
https://www.youtube.com/watch?v=ZYXEgrU_lhs