Hi Sir, just want to say next time you buy a SvBony eyepiece try Amazon, easier to return and Amazon give you a free Prepaid return label too, and it mail back to Amazon US Return center.
You bought from SvBony.com I think their warehouse in China, so you might ship that back to China (?), but I think they have a US location for mail back return, I dunno.
Amazon is your best bet for safest way to get fast return and money back.