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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.
On the pivot end of the bladed knife is a black plug that says pull. They actually mean "Push". push it away from the knife body and rotate the handle half it's mounted in, down. The body will rotate in half , revealing the utility blade and more blades in the rear storage.Also note the blade depth adjustment has a locking detent. You have to push it to the right to unlock the utility blade.and push it to the right when retracting to fully retract and lock the utility blade.
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.
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.
Are you using Stanley Blades or off brand? Hey, I use off brand but sometimes it does make a difference. Second, make sure the blade slider is clean. If you were cutting shingles, for instance, the tar gets in there and screws things up.. try WD-40 spray it liberally all over the blade slide and buttons. If that doesn't work and you purchased it at a Menards store, I can speak of experience they'll replace it no hassle.
I hope I helped
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