I found this video recently on how to repair a rivet style button. Clever, isn’t it?
Simple Button Repair
Repairing a shank style button is even simpler. You just obtain a metal repair shank and glue it onto your button. 
You can find these in My eBay Store
Thank you, for you comments. There not all my buttons on Flickr. My be you can tell me wgere I can learn more about buttons? Because I don’t collect them for button collections, only for use in CQ and other crafts.
Thank you very much for help.