I'd take a hose clamp, screw it on and drill through that. A hose clamp as in a metal strip used to join water hose or secure flexible tubing to a rigid tube/pipe. It has a screw that engages slots in the metal strip around the pipe. For more security of the holes use some extra liner between the clamp and pole.
1) Cut off the end and drill new holes.
2) Drill new holes at 90 degrees to the existing holes.
3) Use a stainless bolt and nut to hold the brush, or net, on.
Note: The clips might also be worn and might need to be replaced.
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