Hello. I've built my own vacuum table and do not want a permanently mounted screen clamping system. I was wondering if anyone has built anything like the system the came on older vacuum tables where there is an adjustable bar that clamps over and under the edges of your table top? It is similar to an AWT Big gripper only it isn't fixed, you can move it to adjust for whatever size screen you are using. I have multiple screens in different sizes that is why I am looking for a system like this. Any help would be appreciated.