After fishing in rough water last Sat. noticed that the jackplate on one side was not flush with the transom about 1/4in. gap on top right side. Found that the bolt was loose. Now to the fixing part. I have not tightened it because on the inside of the boat the washer appears to be eating into the fiberglass of the transom. It has embeded into the fiberglass. Not deep but has started sinking in. I am afraid if I take the load from motor off transom to tighten I will pull bolt, washer and all through transom wall. Any ideas on how to fix this problem? I inspected the transom and have no visible cracks or indentions.