It is usually one or the other. Keys are simple, the key goes in the slot and the pulley is aligned and pushed on. Splines usually have a smooth section on the end of the shaft to rest the pulley on, make slight contact with the end of the splines and slowly turn the pulley until you feel the splines match.
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If the nut isn't tight on the end of the axle, the splines on the axle, in the hub or both can wear out.
Splines are parallel grooves on the side of a shaft that engage with matching grooves in a socket. They allow power to be transmitted between two rotating elements. Splines are used on axles to allow them to be removed and replaced.
Put them in place on the windshield where they should be and then press the arms onto the splines on the posts sticking out of the cowl panel.
What are the techniques of manipulating pencil
Walmart does not charge for cutting keys.