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This utility knife reassemblies similar to the original. The only difference is this model uses two screws and that plastic insert. You will align the two metal halves and bring them together. Use care that the blade does not fall out of its holder and the little black plastic piece stays in place, near the blade. This may take a few tries. after you bring the two halves together you will carefully separate the bottom end (farthest from blade). Separate it just enough to slide the plastic insert into position. Once the three pieces align you will know. With little effort the two metal halves will close together. Install the two set screws and test for proper function. I'm including a Youtube video that shows how to properly change the blade and what it will look like after it is reassembled. https://www.youtube.com/watch?v=5napTSRSyeQ
Use a third blade, preferable mounted to your utility handle, to part them. Handle only from the back side and give the utility knife a slight twist as soon as it is between the points of the new blades.
loosen the screw that is holding the two casing halves together and separate the halves. pay attention to which way the old blade is in the compartment, remove it and put in a new blade in the same direction. close the casing and tighten the screw
On the side there is a big gold wheel, twist counter clockwise and the case should split in half, the blade is held by a magnet, prise the old blade off and replace with new one, then put case back together and tighten gold wheel clockwise
Goodluck!
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.
Push the thumb slide forward as far as it goes exposing the blade. Press the blade change button on the side of the knife (the small button on the left side near the blade) and pull out the old blade.
Insert the new blade and slide thumb slide back to fully engage blade in the internal lock.
Google: how to change blade in Stanley 10-379 utility knife. Stanley website shows how knife & blade look on the outside. Put it together so it looks like that. Sorry, but ain't don't know how to send the picture to you.
I had the same trouble. The blade holder was out of the knife and would not go back in. I fixed it this way: open the screw knob all the way to the least tension. Slide the two parts open but not all the way- there is a tab on the blade holder that gets in the way if you try to drop it in at the fully open position. With the two halves SLIGHTLY open- slide the blade holder in making sure that the tab is seated in it's slot. Depress the thumb tab and bring it to the most forward position and the two halves should be able to be seated together again.
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