not sure if this the place to ask, but since this is DIY whatever.
I want to get the proper tool to install the circular connector (12121705656) on to spark plug wires.
My understanding is as follows:

Do you crimp the middle or upper wider section or both? Also, what kind of tool do you use?
I want to get the proper tool to install the circular connector (12121705656) on to spark plug wires.
My understanding is as follows:
Do you crimp the middle or upper wider section or both? Also, what kind of tool do you use?