eHow - Home & Gardenhttp://www.ehow.com/guide_12-http://www.ehow.com/guide_12-home.html.htmlwww.ehow.comHow to Wire Low Voltage Deck Lights - Pt 4 Drilling Under the Railhttp://www.ehow.com/how_2285548_lights-pt-drilling-under-rail.htmlHow To Wire Low Voltage Deck Lights and Post Caps - Part 4 - Use a 1/2" drill bit to drill up at an angle from underneath the handrail into your auger bit hole. This allows you to feed wire up into the hole. Published on 5/12/2008