“For players seeking the ideal cup depth, Walt Sarad designed the adjustable Multi-Kup mouthpiece. A twist of the cup is all that’s needed to select between 13 different depths. Sarad has several styles available, and will manufacture them to customer wishes,” (Roth, Larry. “OTJ: Mouthpiece Meditations Part 5.” Online Trombone Journal, 1 May 1998, www.trombone.org/articles/view.php?id=55. Accessed 23 Sept. 2026).
This part is from Gemini; “While it looks like a multi-part, modular mouthpiece, the Sarad design uses a captured, adjustable sleeves system. The rim and the outer body are interconnected via threading that allows you to twist the rim to adjust the inner cup depth—changing your tone from bright to dark. However, the mechanical threads are designed with a built-in stop or are integrated into the main body shell, meaning it is not a traditional 3-piece detachable mouthpiece where the rim completely unscrews off the top.
Attempting to force the rim past its engineered stop point will permanently strip the delicate vintage threading and ruin the adjustment mechanism.”
