Premium Photo | Mountain bike repair the master holds in his hand a tool for removing the cassette sprocket remover chain whip
Loose cassette | Bike Boo Boos
Bicycle Cassette Removal without Special Tools - YouTube
Cassette Removal without a Chain Whip - YouTube
If you don't have the chain whip tool, you can use this hack for removing cassette. | Here's pretty smart bike hack for removing the cassette from the wheel with no chain