Recently acquired an 09. The previous owner was a stickler on maintenance. In the collection of stuff that came with the bike I found a homemade tool consisting of a bolt with 2 nuts and 2 washers. Called and asked him about its intended use. He said he used it to clamp through the front rotor "bobbins" in order to rotate and lightly oil them. Looked at service manual, searched online and do not see where anyone else does this on semi floating rotors. Doesn't seem like a bad idea but then again is it a good idea, something I should continue doing every once in a while?