As you said I would't worry too much about what Seiko indicates when it contrasts with professional's best practices. Beside the aforementioned pallet pivots they show to oil one spring finger that contacts plastic, but not another that does the same? Better to spend time in other ways.
I have looked at an old Lorsa that I'm servicing and the springs are of rectangular section. In the calendar works one is 0.20 x 0.40mm, another 0.15 x 0.30mm, and the click one should be like the latter, but (thanks heaven) it's in place already so I can't check.
I think the rectangular section helps in fitting and keeping the spring in place - we all know how terrible these thingies can be. I would also be interested in finding a source for proper wire.
For the first time my Cousins UK packages came affixed with a CN22 Customs Form , even if nothing has changed so far and will not change until at least Oct 31st. Of course there no Customs processing in my EU country for items from the UK, but this has the undesirable effect of showing the value in the package. I asked their always responsive support and the reply was that they carriers are saying that the form is now necessary.
BTW I found that at least in my country the shipping method has to do with the time it takes to clear customs. For example EMS clears in one or two days from arrival, same for Priority from the US. Courier clearance is also very fast but I recommend against using them as long is possible because they will charge nice fees for service on top of whatever VAT is due. They can also re-asses the declared value based on weight and other parameters.
From a discussion a while back on a machinists forum there was mention of California Fine Wire and Mount Joy Wire. I just checked Mount Joy and they have it down to .004" (.10mm) and finer on request; no idea what their minimum order is though.