How to install railing posts. Full vlog episode on YouTube 🤙 Easiest way to layout your railing posts to achieve equidistant spacing and consistent gap in your outside balusters. In the cm pro calculator- Measure from the same edge of your two outside posts. (Right right side or left left side) this is the same as measuring center to center. Divide by the number of panels you have. This is your on center measurement. Now pull from the same edge, Mark your first post at that number, x away from