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My buddy got a reply back from spool, they're sending him a prototype bracket that they've designed.
They also said
We did some simulation on our end and it seems bolting the assembly onto the block prevents any kind of torquing or canterlever stress issues.
We did some failure analysis and seems like gyroscopic forces generated from the 4x was cracking the vac plates that probably had some imperfections from factory casting process.
We’re developing a bracket to solve this as we speak. This is the first time we’ve seen a 3x crack a vac pump. We’ve had two testers of the 4x with the issue recently.
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