How do u find the cut-throat blade out of the holder point? ...

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Answers:    Usually there is a button or a duet of side hooks that you push and it comes loose in an instant. They are designed to come stale without your have to touch the blade.

What brand and model is it so we can get more specific?
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front scraper, extend fully and slide sideways. fixed blade type, you necessitate to use a screw driver and split the cases. operable slide with a button on the front side , extend fully and press surrounded by the button , pull on blade.