Chosen Solution

The white plastic assembly attached to the motor shaft is broken, this is the part that drives the blade assembly. Is this a replaceable part by itself or just come with the motor? Model CSB-76

If the plastic itself is broken, save yourself the hassle and duct tape it, or replace the entire thing. Other wise you can get the other parts separate. For more info: Cuisinart Smart Stick CSB-75 Repair