When buying used baby walkers check all the wheels thoroughly and ,give it a thorough clean too, when you can see its safe for your little one to use then make sure all items at the walker height are out of babies reach ,,easy to forget but makes a difference,, you don`t want broken items and certainly you don`t want an upset or hurt baby..i understand wanting to buy used and  see no reason why this is a no go area providing the item is checked over before the little one uses it...