I need to securely attach a wooden plank to a banister. The plank is temporary so I need a method that won't do permanent damage to the banister (I do not mind plugging holes and using touch up paint if needed)
Please see attached diagram. I don't know if nails or screws are the right approach. Or if I need to drill holes and use one of those plastic tube inserts.
I need to do this because I need to attach a baby gate to the banister but the irregular shape of the banister prevents me from using any pre-made baby gates.