The 9 way Sub-D connector usually has two small bolts protruding left and right of the connector, if you remove these, the metal surround will fall off. I used some superglue to re-attach the metal part. It will work without the metal surround, but this will cause the circuit to bend the CPCs joystick pins over time, so I would recommend you do the same. I also added two M3 screws to hold the Sub-D connector to the PCB, this takes the stress off the pins below the connector, which could otherwise develop cracks in the solder over time as well.
If you intend only using USB mice with the device, it may make more sense to use a USB socket instead of the PS/2 socket plus adapter. I may add the have now added a pure USB version layout for below, the finished device looks like this at a later stage if requested: [[Image:USBMouse.jpg|360px|center]] The USB version has just one jumper to enable / disable the scroll wheel, the Auto-detect is always active.
== Using The Mouse Adapter ==