I have just purchased a new mast hinge and bearingand disk set. On the casting that the bolt turns into to hold the bearing on, is the bolt supposed to show threads if th ebearing is not on. I'm not sure if i have a lot of corrosion around the bolt or if that is part of the casting.
Also where does the little disk go? does it actually go up inside the mast hinge? or under the bearing?

Dave