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Sorry to hear that. I just came up with a possible improvement which I will design and test in the coming days with PETG and PLA. What I did to prevent breakage is not only to drill the lever out with an 8mm drill, but to tighten everything with the M4 bolt, nut and washer. If this is tightened well than you should be able to apply some force to it. But, the stronger the part the better so thanks for your feedback and I will dive into it shortly.