How to install a faucet in the sink's soap dispenser position (hole diameter 20mm)?
You can drill with a glass drill
Like this figure, the joints are 4 points (20mm), online search desktop (vertical) single cold kitchen faucet has, the physical hardware store also sell
20mm just to install a desktop single cold faucet, hot and cold faucet can not be installed, re-open the hole is not realistic
