If you are looking for an easy fix try this. I'm assuming that the area of contact is not contaminated with rust. Get yourself a spray can of brake cleaner from your local auto parts store. Also get a bottle of Loctite Black Max # 380 adhesive. Use the brake cleaner to degrease the points of contact. Give it 15 minutes to completely dry. Apply the Black Max sparingly to all contact points. Press the rib section into position, wipe away all excess Black Max, and clamp the rib in position for 24 hours. Chances are, if done properly, this repair will outlast you! This adhesive is fortified with powdered rubber and has excellent adhesive and filling properties.
PS: Make sure that you have some acetone handy to clean the Black Max off your hands once you're finished, else you'll need to let it wear off!!!
