When turning long very thin, a string steady rest mounted to the tail stock is essential. This model is designed to mount to a #2 Morse Taper arbor such as https://littlemachineshop.com/products/product_view.php?ProductID=1613&category=
In use, waxed string is wrapped around the spindle and around each screw.
For an in use example, please see:
https://www.aswoodturns.com/2024/06/trembling-trembleur/
The author marked this model as their own original creation.