I am in the process of gathering parts for a 9411 build and since I was not impressed by Athaya's crown I started looking at other options. Imo the quality decreased significantly from previous versions (stamping, judging from the pictures). Other than that it is not a 1:1 copy of a 702 crown and I found the spring/clutch a bit wonky. All of this and the fact that you have to pay high shipping and taxes has really made me wonder if it is really the better option. Of course if you want a crown that resembles the original 702, then it is the only option other than going gen.
I found a nice enough 703/704 crown on Aliexpress for around €20 (it is labeled as 703, but it is not crimped, same as Athaya's crown) and giving the fact that RSC often replaced crowns on old subs I decided to give it a go. I also ordered a gen spec tube and later found out that another tube was included with the crown. Just putting it out there in case someone wants another option.
These can be found easily and I will not put links since they will likely become dead in the short term.