Three questions regarding microfasteners:

1. What size bolt and nut should be used to replace the traditional 1/16 brass pin?

2. Looking at the Microfastener website, I see that they offer brass nuts in two profiles. Which should be used on a razor?

3. Can microfasteners appropriate for str8 restoration be found at a hobby shop and purchased a few at a time as opposed to ordering 100 at a time online?

Thank in advance.