I just remembered I had an old Diansheng 3x3 which I bought 3 years ago, and had seen in the Cubing World How To Get Fast video for Feet, where he said that blocky cubes are the best for feet. I tried the diansheng, and it was perfect for feet. Better than either my f/s or my zhanchi. So my question is, the diansheng still locks up quite a bit, I have some sandpaper with me, which points should I mod off and how much should I mod them such that this cube retains the stability and feel yet cuts corners a bit? (even at least 15 degrees is more than enough for me). The cube is seriously good for feet.