Once known as Hartley18
Join Date: Aug 2007
Location: Melbourne, Australia
Thanked 85 Times in 85 Posts
Rep Power: 11
As Still said, it's probably slopping side to side and will need new bushings next time you haul out. It's not a huge job.
If you can get access to the top of the case with the board down, you could push a wedge (cheap rubber door-stops are ideal) either side of the plate as a temporary measure whilst sailing and sleeping - but don't forget to pull them out before trying to raise it again.
Bear in mind that a banging keel it's not only noisy but slow (you won't be winning any races with the board flopping around).
A bad day on a boat beats a good day in the office