I'd work on cutting the weight down. Every 1/2 oz on the inboard tip will need 1/2 oz on the outboard tip to balance it, in addition to the usual tipweight. If it's really 1/2oz, you're net increase is 1 ounce. Plastic and plywood are lighter, and not much brute strength is needed. Epoxy board is another useful material... easy to drill/saw/mill/file, weight is between ply and aluminum. PC board is a decent source, you can etch the copper off, but it is possible to buy bare epoxyboard in various thicknesses.

A single slider, incorporating both LO guides, requires only one lock screw, less weight.  Delrin is nice stuff to machine and holds a screw well, or you could press in a T-nut, helicoil or Keen-sert. Keen-serts would be wonderful, but when I bought a few, the sticker shock was awful...$6 each for 4-40's, and that was about 10 years ago.  Aluminum socket head screws are available, but I'd probably just downsize to a 2-56. Be sure to smash the last few threads on the screw with diagonal wire cutters, to prevent it from doing a vanishing act.  Steve

I *think* a concensus has been reached that dual adj. LOs are not really necessary.  The *top* guys like to keep both LOs as close together as possible, it seems.  Nobody would probably believe it, but at the 2004 WCs I coulda swore that one very prominent flyer had both LOs coming out the same hole! 

I have heeard,( certainly havent the sensitivity to know myself!) that there are gains to be made by being able to move the aft line independent with regards to specific points in specific manuevers. IE more or less tension on the up line(down line for reversed bellcranks.)  As I state, I certainly havent the finesse to be able to ascertain any gain from it, just reporting what I have heard.