Since, I have fortunately a properly equipped workshop and the necessary know-how, I could remedy these shortcomings in about 30 minutes. (Base plate align and thread drill + new cut). For 0815, the customer would be have been a clear case of a complaint. But since I do not feel like sending packets back and forth, hoping that the next holder maybe in order, I took over the repair itself simply.
The holder is now in use and satisfied after my repairs fully its purpose.