Checking the manufacturer's website for replacement parts is the easiest method to fixing damaged parts on your blender. Manufacturers such as KitchenAid make it easy to search for the specific part and guides on how to repair your specific model's issue.
Check the make of your blender, and determine if the manufacturer has the part available for purchase by going to its website or calling the company. For instance, KitchenAid has a segment of its website dedicated to parts and the repair of its products. By inputting your model number in the search bar, KitchenAid gives diagrams, symptoms, instructions, videos, parts and troubleshooting guides to help users with any problem they may incur during blender use.
Other popular blender manufacturers, such as Cuisinart and Blendtec, have online marketplaces that offer parts specifically for their blender models. Depending on the price, some parts are actually cheaper on Amazon, eBay or another specialized retailer. If there isn't a clear set of instructions for the repair on the manufacturer's website, check the warranty on the device. If it is a recent purchase, you may be able to return the blender for a replacement or your money back, depending on the store of purchase.