Drilled out half the pivot hole in centreboard oversize. Then reinserted pivot tube (coated in mold release) back into hole. Epoxy and colodial silica added to make a bush. Tomorrow will bang out tube and do other side the same. Once done I'll then drill hole oversize by about 1mm. All this is so the centreboard can pivot on a 2-3mm epoxy/colodial silica bush. Hopefully this will help stop water getting into the centreboard, swelling and falling apart.