After I received my machine, the silicone pads where unglued it. 

So I design my own version on TPU printed on the Creality K1 because I don't want to spend 5 € + shippment.

Clean up the remaining glue with isopropyl alcohol.

You only need superglue and also, after that, I perform a calibration test (only leveling) to ensure that my prints will print as same as I toke out from the box.

Print a bunch of them, so you will have as spare in case that anyone gets unglued again.