Knex Rollercoaster

This kept me out of mischief building my son's Knex rollercoaster! It was too tricky for him so I volunteered :-) Pleased with my first ever Knex build. Took a few tweaks and my dad straightening the axle before it finally worked: https://m.facebook.com/story.php?story_fbid=10156212329218504&id=521063503