Here are Instructions for a simple knex element that works all the time.
You'll need some special pieces so make sure you to take a look at step1 to see what you need.
This element uses 1 of the newest (slightly larger) knex balls, You'll need 1 of those to make this element.
You can watch the video above (9 New Knex Elements) to see how it works.
Thanks for watching/ building
Step 1: Special Pieces You Need: