The rotors are ready to ship

I've recently gotten some images to confirm that the rotors have been successfully manufactured:

I guess they're going to send the best 9 since that's all I ordered?

The shaft has a lot more going on than it initially appears:

The tolerances are really tight. I'm told that the ID of the bearing is 1.998mm and the shaft becomes 2.020mm OD at 0.5mm before the start of the magnets (as mentioned in the drawing I sent to them). Then, those 7mm-long knurled sections are to improve bonding between the magnets and the shaft.

Paypal auto-currency conversion

Anyway, I've been expecting some unexpected costs to occur between the rotors being made and them being in my hands, and PayPal drew first blood when I paid the remaining balance. 

Unlike business to customer sites like AliExpress, on a business to business site such as Alibaba, it's typical to pay the order in 2 parts. What I didn't know (and have now disabled) is that Paypal saved Alipay as some "pre-approved" payment thing (see image below). Unlike usual, where pressing the button to pay with Paypal would show a popup where I can see and change settings, the transaction surprisingly went straight through.

This was an issue because I specifically changed the transaction currency to USD because my bank gave a better rate (£59.xx vs £58.50 respectively). However, £61.06 was charged seconds after pressing the button, meaning that Paypal's relatively-pricey 2.5% rate was used instead. 

This is Paypal's default and you need manually change who handles the conversion for every single transaction (ie the PayPal popup) and pre-approved company (see image below). I can only assume Paypal doesn't give a global option to never use their converter because that eliminates an opportunity for a % bonus facilitating a transaction.

I'm going to mention pitfalls like these since, as explained, customers usually don't buy on Alibaba, thus online articles are usually written from a dropshipper (or other business) perspective and not some maker that needs a few pcs of a bespoke/customised part.