Instructions for Hornby Ringfield Motor Upgrade Kits (HA5 Only) Step-by-step instructions for our Hornby HA5 ringfield motor upgrade kits. Last revised: 4 August 2021 Share this:Tweet Click to share on Reddit (Opens in new window) Reddit Click to email a link to a friend (Opens in new window) Email More Click to share on WhatsApp (Opens in new window) WhatsApp Click to print (Opens in new window) Print