If I manage to do so is there a reasonable way of
Fill butt, mark hole with indelible marker.
Check recycling info on butt to identify the plastic, get PVc (or whatever)solvent-weld adhesive from plumbers merchants, cut patch from a container made of the same plastic, clean with meths or appropriate cleaner, stick and clamp on patch.
Some plastics degrade in UV light; the whole thing may be brittle and on the verge of sudden break-up.