More proof, if proof were needed, that almost any boating problem can be cured either by WD40 or duct tape.
The seat on the coastal double scull I have been trying was snagging on the floor of the boat, making sliding forward difficult. The solution? WD40 would have alleviated the problem temporarily, but for a permanent fix the rails needed to be raised ever so slightly. So I unscrewed the slides at one end, moved them over, and stuck three layers of duct tape underneath. Now the seat slides gracefully forward for a perfect catch.