A solid Tisken base which can be used to add your own parts to it.
Not designed myself, but remixed from 3 different models... All had somewhat the same flaw, they where not solid or had some design issues so it wouldn't be editable in Fusion 360.
Fixed it in the end. Can't really tell which base model was used in the final design, but I added the Fusion files so you can have the raw model I used.
Hook (10mm) I designed using this base is also on Prusa: https://www.prusaprinters.org/prints/29395
The author hasn't provided the model origin yet.