Shimano parametric tube lock

The stock friction-fit tube lock on my hydraulic bleed kit kept slipping off, so I designed a simple parametric adapter in Onshape that mechanically captures the bleed port nut for better retention instead of relying on oily tube friction alone. This designed is optimize for a Shimano 105 brake caliper (BR-R7070), but I'm sure would be compatible with many other brakes as well.

This combines:
• Tube retention
• Nut engagement
• Lock / unlock leverage

I’m sure this concept already exists in some form, but this version is fully parametric and should adapt to a wide range of bleed kits, tubing ODs (metric / imperial), and hex sizes.

Parametric Onshape file

Materials:
• PETG recommended
• Resin if available
• PLA works for prototyping, but I wouldn’t trust it long-term

Free / open source.