I was told the same thing, but the problem is the hinge at the top. The windows go into a D-shaped track -they go into that track at about a 40 degree angle away from the trailer, then swing down, but cannot attach to the crank at the bottom when that happens as the roller needs to slide into the bottom of the window to do that.
You need to remove the crank entirely, install the window, then put the roller back into the groove, then re-install the crank with a machine screw and a nut & washer. I can't see any other way to possibly attach the crank mechanism.
Yours must be different than mine - there is no way to do what you suggest on my windows. I even took it to Jayco to see if there was some "trick" to it. Their "trick" was to replace a perfectly good window with a new one and rivet that into place just like new. And these things pop off a fair bit -NOT a great design for those cranks....
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