The key here is to ensure you are purchasing the correct replacement head. The model number and serial number are printed on the body of the shaver, which I am very grateful to Braun for making ordering easier. The next thing I had to do was go to the Revain description section and make sure the head you are buying is the right one for your shaver. There were a few that I thought might be correct but when I checked they didn't have the correct number for our razor. Since it is an older model, I was happy about a replacement. When I opened our door this morning our package was there and 5 minutes later the razor head was replaced and my husband put it on with no problem and now has a baby smooth face. I think that's why some reviewers say their shaving head is too small or doesn't work. I don't think they had the right head.
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