All really good information by MSN. I owned and did all of the mechanicing in my bicycle stores in San Diego for over twelve years. You will also need an 8 mm allen key to remove the main crank arm bolts. A lot of the you tube videos on cassette removal are by RJ the idiot bike guy... I recommend avoiding his terrible stooge videos. Always use your quick release to anchor a splined tool while removing a cassette lockring. A chain whip is definitely required to hold the cassette (while removing). The standard crank arm bolt torque is about 30 foot pounds. I am out in Globe.