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A couple of thoughts here:
1) It is always a good idea to get rid of particle board. It is too weak, too heavy, too hygroscopic - too everything
2) The hinge idea should work, assuming removable diagonal bracing
3) In my other post I have a more radical solution: if the upper end is really light (OK, which assumes a truss), then the balance point moves down the tube & the rocker box can shrink accordingly. Then it doesn't need to fold. Bonus: it also gets much stiffer. Using oversize bearings helps the geometry too.
Phil
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