I know what it is and what it is used for. I am trying to tell everybody that the hole wasn't there before I brought the bike in to the shop. Besides...it appears to have been drilled out by a dremel, because it is lopsided and the edges are chopped up. I know that they drilled it themselves.

Now that we have that cleared up (hopefully), then I would like to ask this: are these still manufactured by Haro? Do you think I could contact them to see if they have any?

Whenever I google it, all I see is a chainring that looks like a car's disc brake with a purple middle.