I dont see the point in going to light on mainlines for canals, 0.10 is fine enough, as it means I can feel confident using the same rigs for many years. I dont date my rigs , the winders would get mixed up anyway but I know I set up a lot about 4 years ago just before the birth of 2nd child and I have some older than that. I know exactly how they work and should sit and am gutted when they get trashed as it takes quite a bit of work to get them just so again. There is also the theory that the thicker the line the slower the drop