Knex Leaf Spring Axle Attachment

To be used with https://www.thingiverse.com/thing:7293558
I tore off the alignment tabs and used sewing thread to lash together the spring, securing the thread with super glue. My kid loves it!
UPDATE: Modified the main spring with no tabs and included everything needed to print and assemble. Just lash it together with sewing thread and a dab of super glue.