Oh, wow, that’s amazing, thank you! Though I guess I shouldn’t expect for the measurements to be performed on B&K 5128, is that right? That would have been wonderful, though…
Figured as much with regards to SpinFit W1. They’re quite pricey and it would be unreasonable to expect you to purchase them to address an admittedly pretty limited interest from the community. Though I would still encourage you to give them a try when/if you get a chance. They have a very refined balance of softness and firmness together with a slightly gripping texture that lead to an outstandingly comfortable and stable fit!
I’m not the type of guy to splurge on premium eartips typically, but I’m glad that I decided to try these out and feel like they’re worth every penny.