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I saw a couple of trembleurs in the instant gallery at the AAW symposium in Portland, Oregon. And, then, Eli Avisera did a demonstration that was very informative. The only significant difference between Eli’s process and mine is that I cheated and turned the trembleur from a round dowel instead of square stock. In my experience dowels have fairly straight grain which is perfect for a trembleur.

Size: about 12 inches long. Main shaft is about 1/8 inch. Started with 1/2 inch dowel.

A 3D model of a string steady cylinder is posted on Printables at:
https://www.printables.com/model/918546-lathetail-stock-string-steady-rest

My disk is mounted to an arbor from Little Machine Shop that I have had for some time. There are several MT2 arbors to choose from. If I were starting over, I’d look at this one.
Arbor, Drill Chuck 2MT Tang to 3/8″-24 Thread
https://littlemachineshop.com/products/product_view.php?ProductID=1613&category=

Waxed string is essential. Do not even think about having the disk rotate (it will flop).

Enjoy.