Key, 5x20 mm

This 5x20 mm key is found on both the MT3 and R8 spindles of mini mills. On the MT3 spindle, it is the top most key. On the R8 spindle it is the bottom key.
In your instruction manual, this part appears on the parts list as:
May 25th - June 7th
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In your instruction manual, this part appears on the parts list as: