First of all, Krono, you're the man! The block of wood tip was the finishing touch! And thanks to everyone else on here for their tips on sprocket removal also. I just took some of the things I've picked up on here and put them to work and the rear sprocket removal was a piece of cake. Tools needed were a 17mm offset box end wrench, the 6mm allen wrench that came with the 250L, some blocks of wood or cement blocks, etc. and a good leather glove to save the skin on your knuckles. I had the bike up on the Craftsman motorcycle jack (the bike on the sidestand would work just the same) and after stacking the appropriate amount of concrete and wood blocks up to the correct height, I inserted the allen wrench in the sprocket bolt and slowly lowered the bike back down just until the tire was in contact with the floor. I also put a block of wood behind the rear tire to keep it from turning. Here's the setup....... Then, it took a little tinkering to get things lined up with both wrenches and the allen wrench at the right angle on the wood blocks......with just my left hand holding the allen wrench square in the bolt, I turned down on the sprocket nut on the back side with the 17mm wrench and in turn, it pressed the allen down into the wood block preventing it from turning and stripping the bolt head out. And low and behold, with just a reasonable amount of force, the nut popped loose and it was easy turning from then on. For the other 5 bolts/nuts, just rotate the rear tire until it's in the right position as the first one and proceed to take them all out. No torn up bolt heads and no trips to the parts store looking for the right tools. Simple as that! A closeup of the process........notice I had the end of the allen wrench sitting on a handy knot in the pine block to keep it from pressing into the wood...... I hope this helps someone else out along the way that is looking to replace a rear sprocket.