The missus has a dutch style town bike. the left side crank arm is loose, when she took it to a bike shop for a service (before i knew her) they said don't ride it until its fixed and they need to get in special tools to fix it! So she brought it home because they made it sound like a big expensive job.
After popping a plastic cap of the crank arm to see where it attaches to the BB, there is a recessed nut, quite snuggley in the hole but loose all the same.
My question is: isn't this just a matter of getting a socket spanner (with thin walls) and tightening up the nut? Can I not just buy/borrow the right socket spanner for a hardware store and tighten this up myself?
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