If you are still shooting Large Format as I am, you might give Hopfglass a try next time you need a ground glass replacement. They have been around since 2004 but I just recently heard of them. Their product looks good and I'm about to give them a try. It is a family operation that seems dedicated to quality and service-the kind of business I like to support. I will let you know what I think of their GG when the product arrives.