I always wondered about that piece. I only kept the Anti-Security Blade and the Sonic Beam Weapon from that MoW kit. I didn't even bother with the others and sold them off. When I got my Paterson Squeegee, I sold off the rest of that MoW Kit. One wonders why Christian (MoW) he couldn't just make that as part of the mold to cast, rather than have it as a separate piece though?
If it was me, I'd try to embed a small screw with a Countersink Drill Bit, like this....
[ATTACH=full]238157[/ATTACH]
...into the little MoW piece then epoxy over it and sand it down again and then screw the small piece into the handle while also using epoxy for added strength. Hope that makes sense.
-Iron