Bought 50mm black drain tube, cut it to open up then in 8 inch length. Slot of 2 joining acrylic tubes giving 4 inch to each then jubilee clips.
You'll have a very small hole in the centre where they meet, just tape over.
That pole earned me £3,000 2 weeks after making it. Then bought some alloy one's for 3 storey blocks. Even at an equal length the alloy poles are similar weight.