Below are the pics of the AFM mod. To add tension in the upper portion of the of the flapper swing, I installed a spring. As seen in the first 3 pics, the spring is bolted to the edge of the AFM frame. I used a nylon washer to give the edge of the spring where it's held down some deflection, and the thought is to give it some longenvity. I used a tie wrap and a little dap of glue to hold it to the post so theres no slipping off. Some of the rubber bump stop was trimmed as to not interfere with the spring. The spring is coiled to give it some throw and not tension the first 1/2 of the approximately 94° of movement. This should allow the AFM stock movement for idle and part throttle(at least for most of it). Movement seems clean, and tension can be adjusted by using stiffer springs or length adjustments. The springs are readily available from Orchard Hardware Supply in different lengths and tension. I figure if the spring fails or break, the worst that can happen is the car runs really rich sooner, as the adjustment to the DME and Apexi S-AFC II will lean the fuel out to compensate for the added tension using 42lb/hr injectors. Scroll to 3rd pic for more details.

Next two pics show 1/2 throw and full throw to show how the tension looks. 1/2 throw(or a little past) has no tension until it's past this point, so idle and part throttle are un-effected.