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I used to mess with my old quadarjet all the time on my old classic.

There is a the secondary butterfly flap right. Underneath towards the secondary is a Allen screw underneath that holds a tension screw you can see on the side. Its a bit tricky to get the tension just right. Just have the Allen wrench handy with the small screw driver you will need....and hold the screw steady as you loosen the Allen screw (which is just the hold down) The flat head screw puts the tension on the secondary, the Allen just holds the tension in place. I found on my 650 quadarjet about 1 or 1 and 1/2 turn on the tension screw was enough......NOBODY likes to BOGGED DOWN!!!!

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