Cupped washers for chain tensioner

....so Dis you guys make these washers, or can I pick some up at a hardware store? I'm doing my first build this weekend and I'm concerned about this tensioner. Thanks!

I got them with a charcol grille and they were left overs. I have seen them at Home Depot or Lowe's.

You can, however just run a small drill through the tensioner and chainstay (one side of the tubing only, please) and put in a self tapping screw to keep it from shifting around.

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