The pull down resistors given on the schematic is not what has been incorporated on the shield itself.
Interesting.
The 8101 incorporates pull up resistors on both the CS and Clock pins:

I have recently received a knockshield 2 and have started to get to grips with its complexities. I tried to read all the documention but I did not get any output when using a single sensor input on pins 1 and 2. I subsequently found that the silkscreen numbering of 1234 on the pcb is in fact 4321! T...