this is how it works.the bottom piece is threaded and the top piece takes a flathead screw.you loosen the screw,adjust the clamp and the lock the screw.the screw will lock the 2 plates together.i did test it and it did increase flex the further forward you moved it.i made this one out of 2mm c/f due to my chassis being very stiff,it was the only way i could get it to flex.thanks guys.its going to get some track testing next weekend. i will let you know how it works out.i will also post a disassembled pic so you can get a better idea how it works.