Take the pen nib, insert into the metal rod. take the side the the nib fits in fully. Remove the nib, put that side into to blue tip of the chip

Take the rubber stopper and spring, assemble chose and put them in the blue tip.

screw the chip casing back on. And put the chip back into the case

Slade the chip case back onto the front part of the pen. insert a nib and test the pen on the tablet.if you want more/less resistance on the pen nib, fiddle with how far you screw the blue top to the chip case

put the button pack on, with the raised and smaller section on top, just click it into place.

From the back slide the rubber grip back on the pen. The wider part of the grip should be put on first

take the top part of the pan and click it back into place, of glue it back on. either way it snaps back on with a click.