I got the tip from a mate: If you want to keep the edges/rim of the dials, templates and range ruler from flaying or getting fuzzy then make a mixture of PVA glue and water (aprox. 2-3 parts glue to 1 part water) and then apply the solution with a small brush on the sides/edges of the items. You want to see a slight or slow absorption but certainly no swelling of the cardboard. Any surplus can easily be wiped of and won't leave any traces.
Apply once or twice (of course do not do the dials assembled but take them apart before gluing) and let the pieces dry in between/after applying the solution. You should then see and feel a smooth and hardened edge than will be much more resistant than before. I did all my dials after having done the clear plastic bookcover wrap and it worked fine but I would think it would be even better to do it in reverse order. Could also be done on the base inserts for sturdiness