I know exactly what you mean, but these problems are what I'm trying to overcome.
My version involves a gimmick, but if I manage to realise my vision, a short red rope and a long blue rope will change into a medium red rope and a medium blue rope!!

Bet thats got you thinking!! (by the way, in the above example only two ropes would be used!)
I'm keeping this one quite close to my chest at the minute but I have quite high hopes! This could all change next week though when I have a meeting with someone who could make or break this idea! I'll keep you posted! As for thinking about my magic, I never stop, my obsession is so great, I woke up in bed couple of mornings ago with three coins thumb palmed talking to myself about David Roth's mini table routine

...................maybe I should start to worry!!