Basically the blade tray has a raised nub on both sides that an original blade is keyed to, but the tabs on a standard DE blade overlap them, not allowing the blade to lay flat.
I saw YouTube video where the guy snips the ends off of a standard DE blade to make it fit.
Unfortunately that makes two halves, and you simply lay them on the blade tray and screw the cap on.
That method works, but it's fiddly as you delicately push the edges back to make sure they're both straight and lined up.
I improved the process by simply putting a piece of scotch tape on each side of the center hole on a DE blade, AND THEN snip off the ends easily with regular old scissors. This way the two halves stay together when you snip the ends off, and you're guaranteed the blade edges are parallel. As important, you don't have to fiddle with keeping the edges straight, or one falling off while tightening down the top cap as happens to the guy over and over demonstrating on YouTube.
Pics worth a thousand words:
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