Remove the front sight blade its self, this is done by raising its elevation all the way up while keeping the detent pushed down, becareful not to pop it up in your eye...
when its tension is released, take special care to tip the rifle up side down and underneath this front sight blade a spring and a small detent should come out.
I am guessing your detent is missing, which puts pressure on the spring, the front site blade, and then causes the flip switch to have positive pressure and properly engage when down and up...
if it is missing, you'll have to jimmy rig a small detend to fit that spring to go down in the site, i dont have a picture of it other than it looks like a small fat umbrella..
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