My Norelco AT830 (1st photo) is about 1.5 years old. Lately it tends to go right over some hairs in my beard unless I go over the same spot 5-10 times, so I've switched blades. The instructions on the box (photo 2) did not match my shaving head so I have included a few photos (3 & 4) to help others who have the same shaving head assembly.
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