Get a proper spanner, do not use a box spanner. I needed 14 stitches put in my arm when I snapped one doing exactly tightening bolts on a rear-fixed a few years ago.
@Zippie started
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Get a proper spanner, do not use a box spanner. I needed 14 stitches put in my arm when I snapped one doing exactly tightening bolts on a rear-fixed a few years ago.