I don't use Vault, as I work from my home office as well as work so I have everthing copied/syn'd to a USB drive along with my Styles and Inventor XML setting files. I include this IAM as well.
You would need to copy and edit the flexible tubing CC library to your own Read/Write library and make the edits there. Much easier than creating a library from scratch.
We use a lot of flexibly nylon air-line, so I have created a CC with all the color and sizes we use. The Autodesk Wiki-Help has a good section on doing this. There should also be a PDF in the Help directory of your Inventor install that covers this as well.
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