Making the bushings for the centreboard. This has an iroko bush fitted to the centreboard, pivoting on an acetal bush around the bolt. The acetal bush serves two purposes:

• It acts as a spacer in the centreboard case, ensuring that the centreboard bolt cannot clamp the centreboard too tightly. This makes stopping the centreboard bolt leaking simpler.
• It provides a nice surface for the iroko to move on.
  

Note that the hole in the acetal bush is countersunk – hopefully this will make it easier to get everything aligned when it is fitted.