I am going to start building my first sub on sunday, The problem is that I have no clamps at all. My plan is as follows: 1) tell the carpenter to cut all the necessary boards. 2) I will also tell him to make all the holes for the screws. 3) I will take the boards to my home, glue them together, and then use the screws to make it hold. (Well, It's a DIY sub, I must do something on my own...) Will this work ? can I get away without using clamps this way ?. How much time will the screws will have to be inside the MDF before ejecting them out ?. btw, the sub is going to be a sealed 3 c/f shiva.