Lockdown tool prevents ladders from kicking out
by Cory Doctorow from on (#2XDEC)
https://www.youtube.com/watch?v=1F5G_fqo-yM
Ladder lockdown is a metal tray with super-grippy patches on its underside; set it down on any surface (including ice!) and then set your ladder's feet in the tray and cinch it in place and the ladder won't "kick out" and injure you and your loved ones. (more")