On the back of someone else's post, I've just drilled both sides with a 1.5mm drill, then glued the drill in to each plastic piece and used a soldering iron to "plastic weld" the join. It's not quite straight but hoping straight enough. Glues curing for 24 hours then I'll refit. Fingers crossed...
Same problem, I bought one from an internet 3d printer service but it looked a bit flimsy. In fact it broke on the first attempt. So not very happy with that.
Just in case anyone else is struggling to get into it here's a few more photos of where the locking tabs are. I used a metal Revolut...