These interchangeable heads don't fit properly in a working hair remover. They also don't rotate because they don't fit properly or are too tight. Very disappointed. Update 2/9/21: I found that the Flaw was actually a flawless device. I assumed that if the power supply works without a shaver head then the problem is either a clogged head (original) or a faulty replacement design. However, it looks like the battery might be enough to power the device but not enough to turn heads. New battery installed and the replacement heads are now working. Also, the seller contacted me to see how they could improve the product. One last comment. These heads work on my older Flawless but the newest ones don't fit yet. Flawless has now resized. If you have the correct Flawless, I recommend putting in a new battery, even if the old one is still charged.
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