Not sure if they have a Home Depot in QC, but any good hardware store should have a selection of stainless metric fine thread stuff. In my part of the world (Seattle WA area), we have 3 different stores that carry a good selection. They are not with the 'normal' nuts and bolts, they are typically in metal trays. I actually replaced the hardware on my H&B because it looked a bit wimpy to me.
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