To install an extra wide string hook is easy:

Turn the tremolo over and just loosen the 2 screws that are attached to the brass colored load lever. It is attached to one end of the 2 springs underneath. Remove the 2 screws attached to the frame. The cam now swivels freely.

Remove the six fine tuners revealing three Phillips screws. Remove the three screws. The cam cage now lifts off easily from the cam (the part with the six string hooks). You need to drive out the pin that runs though the side of the cam cage. It locks all the sting hooks in place. Look on the side of the cam cage and look for side of the pin. One side will look like the pin is flush with the side and the other side will look inset a bit into the cage body.

You push from the inset side with a small tap.

Take the tap and gently tap the pin out as far as you need. You can lay it over the edge of a table so the pin can come out easier if you need to, or use a vice to hold the cam cage. Once it protrudes from the other side use a pair of pliers to grip it and pull it out easily with damaging the end of the pin. Swap out with the new hook and gently twist the pin back through the string hooks eyes and gently re-tap it back in flush. It’s fairly simple. Just don’t force anything and you’ll be alright.