What is SafeStop and how do I install it?
SafeStop is used with forward-facing installations for children between 22–40 lb (10–18 kg). It attaches between the harness straps and seat frame. Remove metal plate from back of seat, thread both harness straps onto metal hook on SafeStop. Ensure harness strings are clear before securing child to car seat. Once child is over 40 lbs, remove SafeStop. (Page 39-41)
From the official Diono Radian 3 R manual, page 38
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