I have a couple of bits with broken rear tabs, which are hard to fix. Anyways, I was at a hobby shop, picked up some styrene angle stock with 1/8" width. I cut a piece the width of the chassis, roughed and smoothed the area where the tab needed to be. Then used some Model/Hobby Glue by the Super Glue Corp, this welds the plastics together. Let cure overnight, fanastic results. Shape as needed with hobby files.
