I got tired of my chair's headrest moving up and down constantly so I made these locks. Printed in PLA they snap on easily and when rotated they match the plastics of the chair so you never notice them.

I include the Fusion 360 file so you can easily adjust the height. The included locks are 79mm tall for the top and 51mm for the bottom, I am 6'0" (183cm) and this is perfect for me. When adjusting the height make sure the two locks heights add up to 130mm total for a perfect fit.