Elements are attached to the spacers with heavy gage wire. The SWR will vary in windy conditions unless they are secured to spacers or the mast. The extra time making a jig will pay for itself when you make your 8 folded dipoles. I have decided to stay with twinlead phasing lines as they are easy to build and easy to use for tuning. Figure 9 shows the approach used by the FAA's Lindenblads.
Parallel rods serve as both element support booms and open line transmission lines.
This approach may get around the interaction problems discussed above. The dimensions of the power divider phasing twin lead lines in Tables 1 and 2 are calculated for ordinary 300 ohm TV twin lead with a 0.82 velocity factor. The routing of the 4 halfwave phasing lines effects the common feed Z where they connect to the coax. Experiment with the routing of your phase lines until you get the lowest SWR, keeping all 4 lines as symmetrical and separated as practical. You may need to slightly shorten these lines to get a good match.