Quoted from palacekeeper:Mine seemed to work best under the magnet. If I recall correctly, under Eleven's face had little impact but I'm sure they all vary. That being said, lately mine seems to be less reliable, so I might experiment with putting a shim in both places. I think before when I was testing, further to the right past the magnet actually caused the ball to fly past the magnet, but I'll revisit again. My fans arrive today so I'll check those screws for tightness and add another shim while I'm in there.
Just thought I'd report back for those still working on the TK lock. I added another shim (washers wrapped in black tape) behind the ramp in the left corner under Eleven's head, and wow, that really refined it. In my case, I had a shim under the magnet behind the ramp which made the TK lock work really well, but adding the second shim under Eleven's head really tweaked it even more. It works so well now that many times it goes on the wall even when the lock light is not on, and then it gets ejected off the wall since it's not "eligible" for the ball lock. But, it's an indication that the machine is dialed in very well. This weekend I'll install Pinmonk's fans. Great instructions and packaging by the way - kudos to vireland!