These nets are about $80 in Cabelas. I spent $35 and made my own and it's better because the handle is replaceable. But, I had the paint roller handle machine fit free by a friend. If you can't then that will be extra or you can try hand grinding it to fit snuggly.
Why I like this concept is Cabelas said the drawback is the longevity of the handle, ruining the net, If this extension handle breaks you can unscrew it and get another. You can also buy longer/shorter extensions for one net.
Cheap net - Walmart $10.00
Paint roller handle or extension $ 5.00
Extendable handle - Home Depot $18.00
1. Put the extended extendable handle alongside your net and figure the length you want it when fully extended. Cut the net handle off at the appropriate place.
2. Cut to fit and machine fit or hand fit (grinding) carefully a sturdy plastic roller handle to the inside diameter of your net handle. Leave enough of the plastic outside the net handle to prevent the securement screws from screwing into your extension handle.
3. Place the roller handle adapter you created inside the handle of the net. If it's to loose use black plastic pipe wrap tape to beef up the diameter of the adapter. Insert tightly with extendable handle tightly screwed in place. Adjust the trigger on the extendable handle either up or down as the nets are reversible. Secure with two screws through the metal.
Click on photos