I bought a backup piece of 5x7 ground glass for $27 CAD (including shipping) on eBay tonight. Originally I was counting on a photo acquaintance of mine to make me one but he let me down and did not live up to his word. No problem with this eBay purchase behind me I have no more worries on that issue. I am not sure when I am going back to Thailand but with my numerous problems with ground glass through the years I figured a back up was mandatory. I wish I could get an acrylic (plastic) ground glass like I have on my 8x10 now, then breakage would not be an issue and I could travel with only one.