I'm with Peter Jacobs on this one, rig fresh every time. It isn't like wagglers are the most complicated of set-ups. The closest I get to pre-rigging is to test the shotting and put the actual shot-load on the float in the form of coloured dots (red dot = SSG, orange = BB, yellow = No.1 etc.). I also have a scale on my rod in the form of dots painted at six inch intervals from the hook-keeper so if I know the depth of a particular swim I can get my float into the water with a minimum of setting up - I know the exact shotting and I can measure the rig depth against my rod. Since I tend to fish maybe a dozen different waters in rotation it means I don't have to keep dozens of different rigs set up.
However, if I did keep my rig on a pole winder then loop to loop would be the only way I would attach it, anything heavier would be asking for a tangle on casting.