Yeah, to add to what gggGary just said, once you get the reservoir off you'll understand why it was so hard. The plastic reservoir is sort of like a bayonet/mushroom-head push-fit into the M/C body. I also use a putty knife -- a thick, stiff one with about zero flex -- and a LOT of force. I may have to start with a thin putty knife, and then go up to the stiff one. Be bold, you aren't going to damage anything.