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@Momentum
If you don't have a torque wrench then I would recommend a metric shit tonne. It's very hard to overtighten a crank when you first fit it with standard tools (ie no 3 ft pipes on the end of your spanner). I use a long allen key with a handle that's about 25cm long and tighten it as hard as I can.
You can mess up cranks by continually tightening the bolts every time they feel loose because the cranks gradually work their way onto the spindle. However, if the crank gets loose then you should tighten them ASAP.