Can the mixing shaft of a Waring WSB Immersion blender be disassembled and rebuild? If so, are there any breakdowns of the disassembly?
No. There's no breakdown. Unlike other brands (like Robot Coupe), the shaft assembly isn't field serviceable. You'll have to replace the shaft.
FYI, the cost of doing so is more than half the cost for a new blender.
Here's the parts manual:
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