Finding a very special screw Answered
This cross stood on our wedding cake 50 years ago. The cross has three parts: the cross itself, the domed base, and the anchor rod that goes down into the cake. A threaded end on the anchor rod passes through the domed base and into the bottom of the cross. My wife gave me the task of finding a screw to attach the base without the anchor rod so she can stand it on a tabletop.
I suspected that the threads are metric because the cross and its parts were made in Germany. Screws at hardware and fastener stores in our good-sized municipality are as small as 4mm, but this is smaller, probably a 3mm screw. I could order half of a dozen on eBay, but they would arrive only days before our guests come for our celebration. If anything did not work, I would be stuck. From photos by eBay vendors I guessed the screw I need is size M3 x 0.5. I poked around on the Internet and learned that M3 x 0.5 screws are frequently used in laptop computers. My laptop has some of those for holding the case together. I borrowed one of them for a couple of weeks until after our guests have gone home. My laptop will not miss the screw for a short time. Keep this in mind if you ever need a screw not available locally. Something you already have may be a suitable short term donor.