It's extremely useful and a very elegant design. I tried modifying it in Fusion 360 but couldn't quite figure out the basics so far and ended up just adding parts in FreeCAD. Your design replaced a very ugly hack made of aluminum sheet stock. I just needed to be able to quickly change heads. This is something that really should be included with the basic kit with the Magma nozzle, it's absolutely essential. Thank you so much for contributing this!