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Q: What size bolt should I use?

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m6x1.00 x30mm is to small. what is the right size for the top bolt fixed guide?

Hi - From your description, I’m not sure which bolt you are referring to, but you can measure both bolt diameter and pitch to determine the answer to your question. The pitch can be measured with a thread pitch gauge and the diameter can be measured with a micrometer. Then, you can purchase the correct bolt accordingly.

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