Thought I would post a video of the knocker coil, sorry the video is sideways the coil is installed vertically, but it gives you an idea of what's going on. It just can't seem to hit the end to make the knock noise.

http://tinypic.com/r/1jninn/9

On a separate note shortly after I got the knocker coil working (albeit pretty pathetically) the game decided it doesn't want to let me play it anymore.  When I turn it on it appears to go through the start up procedure with no problems but it won't let me start a game when I hit the start/credit button.  I was playing a game when it first happened and it just stopped working like I had tilted it, but now it won't let me start a new game.

The button/switch is fine because I can use it when going through the diagnostics/menu etc.

I have done a video of the start up procedure to see if anybody can spot anything dodgy.  I have run through the switch as well as coil tests and everything appears to be fine???  I'm ready to put this POS on the verge 

http://tinypic.com/r/kejiuq/9