Brio Track Snail

Mechanical snail toy for Brio railway.

https://www.youtube.com/watch?v=4Jdn8rFApnw&feature=youtu.be

Attach a Φ5 magnet to the hole at the front of the snail head and watch it crawl around the railway. Use a screw or other magnetic item if magnet is not available.

Thread for assembly is already designed into the parts. No fastener/screw/glue is required for assembly.

Comments are appreciated.

EDIT (25 Oct 2018): Changed the length of the screw on the right hand size of the snail.