hi mate dont move all the bales move em 1 at a time buildin a wall between you and the exits so when you get to the last level of bails the rats have nowere to run they work down to the bottom so when you get down get ready its a good way of controlling the bolts and works really well we had a peggy tub 3 quarts full when we did my mates fathers barn ps make sure you av dogs in wi you lol good luck hope this helps