Quote:
Originally posted by axle59:
O.K. How about making the C-channel move back and forth also, maybe with some sort of set up like they do with roler coasters i.e. a wheel on bottom and wheel on top to keep it from falling off?
Then you're back to square one, but now have two things that move and will end up wearing. You've also added a great deal of complexity and cost.

CALMINI's design is the correct solution (simple, cheap, mechanically sound), let the centerlink do one job, and one job only, keep the arms in phase.
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