can be modified to get 13-16-19 degrees.

Line the dish up with 16e as its main focus, then cut off one side of the lnb bracket so the lnb can be swivelled through 180 degrees manually.

Us a nylon tie cord to hold the lnb tight and straight on the bracket, this turns the lnb upside down which brings the polarity back to normal for hotbird or astra 1 and W2.

Its a manual fix but if you can reach your dish it works well.