The parts are actually just small O-rings made of transparent material (feels like silicone on). One pulls the individual keyboard caps off (the Ducky Shine 3 is an appropriate tool for) and inside out the small O-rings from the bottom on the small "pen" with which the cap is mounted on the switch.
This works without any problems and should be able to anyone who is not just an outspoken Grobmotoriker. Of course that's a bit fiddly and in view of the many keys on a keyboard a little time consuming.
The volume of MXblue is then in direct comparison clearly really small (I have a trial first times a few buttons left unchanged), the typing feel remains fairly unchanged (but me comes the "stop" bit softer before).
An overall improvement and definitely worth the price.
