Several common glues function very well on many forms of rigid plastic, including two-part epoxy and immediate glue (cyanoacrylate). There are two-part acrylic glues made only for gluing plastic, like Super Glue Plastic Fusion and Loctite Epoxy Plastic Bonder, but neither are advocated for gluing polypropylene and polyethylene plastic.
Another option is a two-part instant paste, Loctite Plastics Bonding System, that's designed to function with most all plastics, including polypropylene and polyethylene.
Age or some adhesives dry to a light yellow colour, so ensure that you truly have a great fit between the bits and wipe off any excess. Hold the bits in place until into the glue sets, or use modeling clay, clothes pins, spring clamps, or rubber bands to hold the parts before the glue dries.
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