In reply to andy67: I always used a dribble of superglue just at the front. Meant the gaiter were stuck to the boots for ever but that was no big deal as I always wanted gaiters on my big boots anyway. This was on my Scarpa BX which had grooves along the edge and a groove across the sole for the thin rubber band.
Kind of coincidentally, I just cut the gaiters off my boots as the rands were perished so I was going to buy some new ones but then I found my feet had grown so the boots no longer fit anyway. Now I have a nice shiny pair of Scarpa Mirages but I'd have to cut grooves in the sole (or cut off the band) if I wanted to fit Yetis - seems no-one makes a yeti compatible sole anymore.