For international convenience here links to all the stuff from Amazon. Please buy elsewhere:

PVC Tube (buy a 2m piece, 2 x 60.5mm needed):
https://www.amazon.de/VALEKNAFLEXTUB...

PVC glue:
https://www.amazon.de/well2wellness®...

Flexible tiny grabber:
https://www.amazon.de/KraftmannFlexi...

Scotch tape:
https://www.amazon.de/tesaPackbandH...

Pulling wire (full copper, 3phase, 8mm diameter):
https://www.amazon.de/Installationsle...

Disk break cleaner:
https://www.amazon.de/presto315541P...

Foam filter for noise reduction:
https://www.amazon.de/LZYANGSchwimmb...