I recently had an international flight and the air stewardesses gave my children small "goody bags" with toys. One of the toys was a little set of interlocking flexible rods of different colours and different lengths made of a soft plastic such as this:
I spotted the potential and when I arrived home I fashioned them into a couple of piano hooks, placed at the far left and far right of the piano in a shape that allows them to latch in the space under the music desk towards the tuning pins, and into the inside of the piano lid viz:
My children love them as they are colourful though I must admit I'd prefer for them to be plain black as it would blend better with the piano but beggars can't be choosers. However, these little gizmos do the job perfectly as it's impossible to shut the lid when it's held in place by them. As they have a soft foam-like texture are most unlikely to cause any harm to the piano finish too. Does anyone know what they are and where they might be available in black? The packet they came in had the name of a Chinese company that supplied fancy goods to airlines but its website was all in Chinese so I have no clue how to go about ordering any extra ones.