Sorry, but i dont understand what you mean" block them in each end"?? The rabbits will be mostly congregated in the "stop end" anyway pal! And theres only one way out. So blocking in them in means nothing. You would realize this if you had used a locator, and followed your ferret underground, and worked out the earth.
A "good thin working" ferret will find the stop end, and then flush your rabbits out. If you enter a big dog ferret, you will often find that when he reappears, that he has rabbit fur hanging from his claws, blood around his mouth and so on. This is where he has reached t