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Here you go this is part way through construction I cut 15cm of the 20x20mm U section drilled two 6mm holes in the middle 35 mm apart centre to centre and then inserted some 6mm diameter aluminium tube and cut it to length - they are in place in the photo (you could use the normal 5mm threaded bolts which you can use to join the sticks - see bottom edge of lhs photo) but I figured this would be smoother and allow me to use smaller bolts to fix it together and less likely to undo. So then I glued some 12-14mm wooden dowel inserted 3" in the open end of the garden canes with gorilla glue so that it was stronger to drill through - once set I drilled 6mm holes centred about 1cm from end of the top of the sticks - rounded the ends of the drilled sticks with a file or disc grinder then align holes with those in the U section, insert aluminium tubes to fix the ends of the sticks into the U section and fixed in place with some 3.5 mm threaded bolts, washers and nylock nuts check the sticks can open as required at this point - further filing may be retired- cut off the excess bolts and file smooth then bit of heat shrink tube over the ends of the U section followed by pipe insulation fixed with insulating tape then camo tape over the top. The U section shown is a reject as you can see I didn't drill the holes accurately and the result is the tubes which will go through the top of the sticks arent parallel! It's a lot easier to do than write it��