The folding mechanism is speedy, effective and user friendly. To tighten, you pull up on the metal lever then rotate a security collar to lock into position. The plastic collar prevents the folding lever from unintentionally getting pulled down all through Using, so is a superb and easily used security https://wm36587531.pages10.com/เส-อม-งกร-things-to-know-before-you-buy-66082566