Try to keep equal weight on all 4 casters. When you install these casters on all four corners of stool, "9daN"x4=about 36daN of weight, operates the four caster mechanism. When using casters on stools and step ladders, insufficient weight will prevent th
I happened to discover and purchase such a self-locking caster, but if it is heavy it gets locked naturally with its own weight, and when moving it gently lifted the wheel and it was able to move and move. Just a long distance is a bit inconvenient?