This allows you to lock telescoping carbon fiber poles in place to create your own extendable pole. This works well with carbon fiber rods purchased from https://www.aliexpress.com/store/group/100-pure-carbon-fiber-tube/4795009_514577525.html Just be sure to instruct them that you want the poles to be nest-able/telescope-able.

Printed using Prusament PLA Black with 0.4 mm nozzle and 0.2 mm layer height. No supports necessary. Cut supports included in design with cutter knife. Put some silicone grease on the threads and screw it on and off afew dozen times to wear the threads in before using it for your telescoping pole.

bse_0101a.scad and bse_0101a.stl s a bonus, it's an adapter to attach a spray can to the end of a telescopic pole.