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By flipping I mean turning the handle to use the other edge. I do not take the blade out. I am new at this so my terminology may be confusing.

And btw redtruck I replace my blade about every 5 shaves. As mentioned earlier, your mileage may very.

2 edges should last twice as long. I use both sides during the same shave. Shave one line, flip shave another Line, rinse. Not sure about the numbers.:shrug: