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I have been doubtful about OTAs with 2 or 3 vertical struts , they simply can not be as rigid as OTAs with 6 struts forming 3 rigid triangles , unless they are huge and the connections at the top and bottom are super rigid (no movement permitted).
3 or 2 struts is cheaper than 6 , but to sacrifice OTA (surrier) rigidity by scimping on a few dollars per OTA by having a substandard strut and connector design is just stupid.
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