Question about Stanley Fatmax Xtreme Retractable Utility Knife

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How to open stanley fatmax knife 10-778 TO CHANGE THE BLADE. thank you

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How do I change the blade on the quick change/instant change knife? Warning: Blades are sharp and can cause serious injury. Be extremely careful when handling blades. Wear eye protection and dispose of used blades properly, such as wrapping in duct tape.


FULLY EXTEND THE BLADE.

Press down and forward again on the slide button until the button is in the full front of the top slot (0 through 3 in the below picture).

Note- the blade must be extended beyond the 3rd detent position. This will cause the slide button to remain in a down position, allowing the blade release button to operate.

PRESS AND HOLD THE BLADE RELEASE BUTTON ON THE FRONT SIDE OF THE KNIFE. (Step 4 in the below picture)

Note- if the blade is not fully extended beyond position 3) , the blade release button will not work.

Remove the old blade carefully.
Insert new blade.

NOW, RELEASE THE BLADE RELEASE BUTTON.
ENSURE THE BLADE IS LOCKED IN PLACE. If the blade does not retract, try carefully giving a slight tug on the blade to reseat.

Posted on Feb 14, 2018

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Posted on Jan 02, 2017

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SOURCE: Just purchased a Stanley FatMax 10-778 retractable

1. Make sure the side lock is unlocked.
2. Push the thumb tab all the way to the front of the blade handle.
3. Insert the blade in the opening, you may notice two notches on the top side of the blade.
4. Press the small blade release button as you slide the blade into the knife. You may have to jiggle up and down to get the two notches on the blade fully into the handle.

If properly inserted, the exposed area of the blade should look very close to an equilateral triangle.

make sure both notches of the blade are inside the handle. They notch into the thumb lever.

good luck

Posted on Apr 11, 2010

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The model in your picture is a fixed blade utility knife (model 10-816). Your question asks for instructions for model 10-778, which is a retractable knife. I'll guide you through the 10-778 which you asked for, if you need instructions for the pictured 10-816 please re-post the question.

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