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I measured all the bolts as I was assembling, the measurements reflect the required bolt thread length, not the overall bolt thread length. The two 32mm long bolts for the idler tensioner are correct. The longer bolts for the backplate with a metal backplate should either be 35mm or 30mm long for the most part. The 10mm long bolts worked fine for the T-nuts and parts as printed on this end, I just pulled one to measure. Maybe they sent you the wrong bolts? I'm sorry that you were annoyed by that, it wasn't my intention to annoy you. The small spacer is designed to be threaded onto the M5 bolt to provide extra support, you can certanly also drill it without affecting it at all, and if a printer is overextruding the hole diameter may quite possibly be too small. They print fine on mine anyways. At any rate, sorry you wncountered difficulties.