I have an almost 40 year old Pacifica GT 400 potter's wheel. It's been a terrific wheel with only minimal routine maintenance needed until now. It seems to have a top and a bottom bearing and it needs a new top bearing. I don't want to tear into it without some guidance from someone who has done this before, but Laguna could provide no help at all as the wheel is too old. To help date the wheel, it has a lower bearing attached to two steel straps welded to the frame. TIA for any help anyone can provide.