I only restore for myself but I think that qualifies me.

1.I try to match it to original, within the scope of my current skill level.
2.I think they're #00
3.Never saw a vintage razor with stainless washers. So I guess none of the above.
4.Yes, people do that. Soembody even made a video and put it in that thread Gssixgun referenced I believe.
5.Not me.