I really hate group project with some strangers in different diciplines.  You don't know how many efforts I imput to the experiment!  The only thing you know is easy to do so.  Yes!! Of course YES, you only need to put the deadweights onto the suitable position.  Do you really think about how many things I had done before the success.  Do you really consider what you have to do?!!!!!!  Even this experiment is fun, I hate free riders!!!  Please get out of my life!!!