Not stable!

I bought this for my elderly parents. Although the base of the step stool is sturdy, the upper step does NOT screw into the base and does not lock in. So essentially it just sits on top of the base with just small plastic nubs which slot into the tiny holes in the base. So the top step is NOT secured and can move off the base. Very disappointed. I need a sturdy, well built step stool which won’t slip for my 80+ year old parents!

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