I went through 4 iterations of HM-901's until I finally received one that worked to my satisfaction. It was a lot of back-and-forth with HiFiMan support but fortunately they eventually came through for me. During my exchanges with HiFiMan, I ended up acquiring an extra IEM card. I originally intended to keep it as backup but I've decided to sell it.
In addition to the sale price, I'm asking for the buyer to pay Paypal fees in addition to shipping.
Thanks for looking!