Tonal T-Lock One way Insert
thingiverse
This is a one-way insert for the tonal shelf at https://tonalshelf.com/ They drill a hole in the wood which allows the t-lock to spin freely and need to seat on the lower plate. My wife kept missing the grove because there was no hard stop. The accessories would constantly drop to the floor. I created this so that it mimics the machine and has a clockwise stop and counter clockwise release. Check your hole depth I'm not sure how the quality control is but mine was a tight fit at 22.13w and 22.30 deep so those are the dimensions of this model.
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