"Using a piece of plywood and some zip ties (and some duct tape for flare, obviously) solved what was until then a total nightmare trying to find a tension-mounted baby gate that worked on a rounded bannister post. Seriously, this was driving us insane, and whoever posted this before on Daddit has my undying gratitude. Now I just need someone to tell me what hardware store purchase can fix my kid getting sick at daycare all the time, and I will truly be made in the shade."