Customizable Hook v2

Parametric hook, universal and very strong.

This is a remix of the great work of https://www.thingiverse.com/sergep, who did the original design https://www.thingiverse.com/thing:1367661

For my application, it was missing a spacer between main hook and tip, and so I added one. Still fully customizable and the additional spacer can be disabled by setting to zero.

For awesome documentation, please see sergep's page.
All credits to him, I only took the great work that was already there.

Enjoy!