Step 1: Deassemble the USB Mouse.
Just focus on the bottom side the mouse where the red optical light resides, just below of it you will see company sealed sticker just remove it and open the mouse by pushing the bottom cover in upward direction to unlock the device.
Step 2: HANDLING THE PCB WITH RED OPTIC.
Suggestions - If you are not familiar with the soldering techniques or you are new in learning please do this in a parent supervision . You will have to learn good soldering skills.
Evey usb mouse pcb comes up with three buttons or we can say IC that we use to do the left/right/scroll with our mouse.
Keeping these concept in mind we will now desolder this connected buttons and w'll use it in our handmouse as a extension to our fingers .
Step 3: SOLDERING THE EXTENSIONS WITH PCB
Step 4: ASSEMBLE THE HANDMOUSE.
Make sure the red optic which is attatched with the prism in order to emit the red optic is pointing downwards to the pcb.
This prism along with red optic well act as sensor to the handmouse.
Now connect those ribbon wires along with mouse buttons to pcb and wear it with help of plastic or copper wire rings for support. I made copper wire rings for convenience.
Thats it !
Your handmouse is ready , now just plug the usb cable to your pc and start doing mousework .