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It is usually a fairly simple conversion. The discharge are on the deck will have to be completely covered with a plastic cover which should have 2 attatchment point. The regular blades will have to be changed out and the new (or used) "mulching" blades installed in their place. The design of the blades is different. That about covers it.
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.
the instructions are in the owners manual and on the back of the package for the new blades. if you can not understand those instructions, why would reading them printed here make a difference? what you need to do is go to autozone or advance and buy the blades from them, their sales guys will come outside and install them for you. so where ever you got the set you have, take them back and go to one of the parts stores aforementioned.
The blade is clamped to the saw with two screws. Unscrew both screws slightly. Pull down on the blade to remove. Blade holder may have a pin that engages blade. You may need to giggle the blade back and forth. Install new blade inreverse order.
I'm not sure why the instructions said to change the blade in order to cut the slot. I've made several of the zero clearance inserts (for different blades) and always made the slot with the blade I intend to use it with. Of course, you need to match the inserts to the blades (I just tie wrap them together.
should have blade lock button remove blade with proper size wrench reinstall new blade in reverse remember some of these the loosening of the blade will be clockwise so if nut dont come loose try clockwise to loosen good luck