I just got a new 09 Nytro MTX and I am a new rider so please forgive my ignorance. The rear suspension drop brackets have two holes in them. The top holes are the ones being used. I was thinking about getting timbersled drop brackets but I havent read anything good about them. It looks like I could easily drop the rear track to the bottom hole. Is that what its for? I cant see any other reason for the two holes. Thanks.