If the solderless adapter is not going all the way in, reallign with teh center of the pogo pins into the center of rivits and push down with one hand then use other hand to screw down.
You will notice on a successful install a few things:
1) The black plastic from solderless adapter is flush almost touching Xbox motherboard.
2) The screw that secures the solderless adapter will not be centered in the hole to screw it down.
3) The D0 wire if you touch it will not move from its original lovcation, will always spring back.
4) You will barely be able to see the white lines from the box around the LPC port, or will see that your soldereless adapter will run in paralel with them.
5) If you apply slight preasure to solderless adprer it will not move, if it does possiblities is stripepd screw, or no solder in holes or missing rivits if no solder in holes.