The quill shaft is a splined shaft that is about 1/2" in diameter and maybe 8" long. It drives the blower from the engine's gear train. It acts a safety fuse to prevent damage to the blower from things like a driver revving the throttle up or down pretending to be a race car driver. An engine that is hunting can also cause the shafts to break.
They are normally magnetic, so you can pull the broken pieces out with a magnet, however there were some batches that were non-magnetic so it was a lot more complicated getting the broken sections out.
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