the size 10 spro swivels are so small that the knot on the lead is thicker than them and it is not a problem and when fishing winni our drags are set usually about 1 lb. or less. it is pretty hard to tear stuff up with 1 lb of drag maybe if we were talking heavy duty stuff like big stripers or tuna it could be a problem but not our fish. more often the tag end on your knot will hang up rather than the swivel itself.
note: yes, all rods are different and have different action speeds and different sized guides and pick any other exception you want but on my cheapo (which i like the best) eagle claw light rods it is a non-issue.