Found 2 3D-models for “focusing tube” across many websites

#variable extension#Helicoid#telescope#celestron travelscope#Fujinon#telescope mod#Celestron#Sony E-mount#M42-4-E-Var#Pentax
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M42-4-E-Var - A Focusing M42 to E-Mount Adapter

M42-4-E-Var - A Focusing M42 to E-Mount Adapter

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Focusing Tube model for my Celestron Travelscope 70mm

Focusing Tube model for my Celestron Travelscope 70mm

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