A few years back I manufactured a front sight adjusting tool for my 91/30 Mosin Nagant rifle. Friend saw it and wanted one, then HIS friend saw it, and we all know how it goes after that. Started selling on ebay a few years ago and it quickly grew from a hobby to a full-time job for me. Today I sell through a few commercial retailers and my own website, and frankly can't make them fast enough to do ebay sales as well. I've shipped to 13 countries so far, and am one of the sponsors of the Russian Mosin Nagant forums and website and have sold literally thousands of these little tools in the past few years. Here is a link to my website, it's nothing fancy but it does the trick.
Wow! I would have NEVER thought that there was such a demand for a Mosin Nagant front sight adjustment tool. I had one years ago and was more concerned with finding non-corrosive primed ammunition.