Can you use crimp connectors on a solid wire? - Quora
code compliance - Are there any restrictions on using crimped connections to electrical devices (receptacles, switches)? - Home Improvement Stack Exchange
electrical - Can stranded wire in a crimp (bootlace) ferrule be used in lieu of a pigtail to terminate to devices that require solid wire? - Home Improvement Stack Exchange
Terminals make wiring easy
How to Make a Quality Crimped Joint : 6 Steps (with Pictures) - Instructables