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Has anyone ever built


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8 hours ago, Black Panther said:

Their own solid vang? I remember seeing a design a while back using squash balls.

We used to use squash balls under concrete pavers to support turntables in nightclubs/dance parties etc. We replaced them every month or so. They rapidly lose the air within and quickly become a mush of rubber when under constant pressure.

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15 hours ago, Black Panther said:

Also if I remove the toppi g l7ft what happens to the back of the stackpac 

You will still need a topping lift. Even the best systems only support the boom temporarily. Without a topping lift your main sheet won't have anything to brace the boom against and it will swing all over the place

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I'd use urethane skateboard bushings.  A lot of early mountainbike suspension systems used urethane bushings as the "spring".  Stable, takes huge load, available in a wide range of compression strengths (duro), easily replaced and tuned (stack different duro bushings in different lengths to tune).

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