Hole location for Herbie for overflow's

[Palmer]

Thanks Delphinus

Good points about the placement. I was just thinking if you make the hole to close to the edge it may facilitate a crack from the hole to the edge. Like a stress crack etc

Current ALL GLASS info says its not tempered but I bought this thing in 1998 so who knows. This will reveal my stupidity but what are polarized sunglasses? Do they just have a little sticker in the corner telling you they are? Can I get a pari at Walmart and what will I see if it is tempered??