This is me being fussy – I know – but I don’t really like wood bearing on steel bolts. Thus I wanted to put a bush into the rudder plate to act as a bearing. I was going to use acetal/Delrin but this is tricky to bond to the rudder blade, so I used iroko instead. While this is still wood it is very tough and pretty much waterproof. It can also be epoxied to the rudder blade.