Historical Straightline Chuck
A Straightline Chuck is used to hold objects vertically, and allow for ornamenting them that way. The object being held moves up and down (along the Y axis), and rocks back and forth (the X axis). It does not rotate around the lathe's drive axis (the Z axis).
This is particularly useful when making ornamentation on cylinders like pens, or on long, flat objects like bracelets. Lindow Machine Works makes a very nice one that has even been used on an MDF rose engine lathe.
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You can delay getting one of these.