So, after my first forays into pinning, I am curious about washers.
The question is, every time I have unpinned a vintage razor, the washers have been small cup washers. However, I note that in all the tutorials I have seen (eg https://shavelibrary.com/w/Un-pinnin...inning_a_razor) and all the various places I have seen where you can buy razor 'pinning kits', that the washers used are flat washers.
So, why the change from cup washers to flat washers? I have looked and looked for cup washers of that size, and have not found any yet. Is this the reason, availability?