Here is a used “Miller Machine” Triangle Machine. Hang a triangle from the cord and it can be played cleanly by striking the red rubber with any stick or mallet.

Photos show the exact item for sale, but the last photo is a stock photo to demonstrate the setup. TRIANGLE NOT INCLUDED!

Securely packaged and shipped fast.

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For your reference, here is the description from the manufacturer:

With The Miller Machine Triangle Machine you can play your triangle with any stick, mallet, or brush, it frees you from clumsy and difficult implement choreography.

Especially helpful in a modern pit setting, where you're expected to play multiple percussion instruments at once.

Easily positioned anywhere in your setup

Adjustable to fit different size triangles

Great visibility in dark pit settings

Easily packed in your stick bag