We warranty our parts 100%. If you're not satisfied, we make it right.
In your case, we didn't ask for your defective part back. We let you know we'd ship a replacement, based on your description of the issue you're having.
Upon checking notes when I got in the office this morning, we show we mailed you a new SMC 1" Light Mount complete kit on 4/3 USPS First Class, no tracking or signature and at no cost to you.
Since you didn't receive it, we'll have to send another one fork free today with tracking and signature delivery at no cost to you. We'll email tracking this afternoon.