sentence: A woman is giving instructions on how to install and adjust a saddle on a bike. sentence:  She uses a Allen key wrench to loosen up the bolt. sentence:  Then she demonstrates how she can move the saddle after she loosens it. sentence:  She hits it with her hand to push the jammed saddle. sentence:  Then she shows how to adjust the saddle by moving it back and forth. sentence:  She later demonstrates how to remove the saddle off. sentence:  She puts the new one on and then uses tools to tighten it back on. sentence:  She uses a screwdriver to tighten the screws and adjust the level. sentence:  She then shows another saddle and demonstrates how to tighten the bolts to adjust the level of the saddle. sentence:  She shows how to tighten the bolt to make sure the saddle fits snugly.