Take 10 golden triangles, arrange them with their sharp points touching, and you have a golden decagon, fitting perfectly within the iris of the eye, vertices neatly touching the rim.
Some common troubles such as poor throwing power,burnt deposit on rim,dull gray coating,piebaldism,blue film,hazy deposit,spongy surface and roughness in decorative chromium plating were summarized.
You will increase the chances that you sink the shot or that you at least get the ball close enough to the rim that you don't embarrass yourself and become a meme.
Any home canning or any kind of canning that you do, you want to make sure that these rims are clean, no product, nothing on there of any description so that it interferes with the sealing process.