Nail in the center of the slot.
Installing sillcock aluminum siding.
For vinyl siding use aluminum galvanized steel or other corrosion resistant nails.
Then go outside and complete the hole by drilling through the siding.
How to install individual aluminum siding corners of hardie plank siding.
When installing the trim at the windows start at the bottom then move to the sides and install the top portion last.
Attach the siding to the wall with a nail in each section of the nail strip.
Each sheet of siding has a nail strip at the top.
You can now place the sillcock in the hole and get a better idea how it will sit.
Press your bit into the siding that covers the outside of the house just far enough that it makes a hole with the centering part of the paddle bit.
I have one on the back that was already on the house and there is a square plastic mount that the sillcock is attached to and the vinyl siding is cut to fit around it so that it looks decent and doesn t smash the siding.
This will help control water flow and prevent leakage.