you move the angle of the entry poles
it is about the placement of the reward...
Let me try and explain ... how I did it.. Disclaimer again hey, I am a noob
This is how my Instructor got us started on it and it worked for us!
Picture the face of the clock... 12 is the direction you want the dog dog to go, draw an arrow and mark an X where u gonna throw the reward
At first you put the first 2 weaves at 9 and at 3 which is a straight position, then draw a mental (or chalk) line to where to throw the reward ahead of you and the dog, just past the weaves. There is no wrong entry at this point, just to get the dog used to the motion and drive towards that entry! (It's brilliant the more I think about it...)
Then next step you change YOUR position in relation to the dog yet continue to reward the dog only at the same reward point as before.
Once he masters this you can add a second set of weaves also at 9 and 3 o'clock position. You reward every time after the second set, but intermittently still reward after first set, so the value is IN the weaves not only the last one.
Then if he drives all the time for that SECOND set and knows his job can you SLOWLY start closing the first set of weaves and change their position to say at 8 and 2, then 7 and 1 then 6 and 12 which is closed poles. BUT still reward only AT the STRAIGHT line.. reward still falls ahead of you and the dog at the same spot, even if the position of the poles has changed.
This way you can keep adding a set, the dog starts to only get rewarded once you close the weaves if he does the left shoulder entry.. however it comes way more naturally I find with this method as it teaches complete independence, here you can see Toffee thinking about it. and get an idea..
I have here closed the first two sets and just added a third... am wayyyyy too late with the reward but u get the idea.
http://www.youtube.com/watch?v=ZmWb8N3Cm_Y&feature=player_profilepage
You can almost see him think.. what the heck happened here, Mom? hahaha Thinking and it's a tough job for them... again I didn't place my reward properly which is why poor Toffee could not learn to do 12 weaves in 12 days

I kinda suck! But have fun!
http://www.youtube.com/watch?v=B4mBVqwFoKk&feature=player_profilepage
See how he is trying to fix it in the end with his LEFT shoulder? I don't babysit, I don't guide... I wait him out and chuckle, no reward then he does it again and he gets the reward.
Then I closed them and here is what we had after a maybe two weeks of small daily sessions?... I have to make a new video to show where he is now, he is doing 12 fine even with different types of weaves he had no problems. We are still working on it, but the main thing was a bit of training every day or every other day instead of long sessions... I never did more than 5 to 10 minutes TOPS. Their brain fries!! lol and then it is no fun for them
http://www.youtube.com/watch?v=n8ap5w3GxAM&feature=player_profilepage
Hope this makes a little sense to some of you who asked....