Yeah, the instructions really need to be updated. Looks like your uprights were probably too long, should be 210 mm. I did the same with mine, cracked just like in your picture. I don’t think there is much long term damage, but it really should have you measure the rods and either shim beneath the support or trim the rod to the correct length. The instructions to tighten it down are just misleading since we know the rods have typically been too long in quite a few cases.
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