First off let me tell op that I did not know the anchor cart would allow it to continue mining, I already encountered this problem and just turned the bore around. Secondly I believe the rarity of diamonds to have been increased since I once spent hours and only found 3, since I've used the bore I've already gotten 15 more with the benefit of multi tasking, another reason why the bore is superior to strip mining techniques of going directly down until you hit bed rock, this allows you to mine exclusively in the diamond strip. Hence the quote even if I could get it to mine down instead of sideways I would not do it anyway