I bought a junk snowmobile for the engine. It has a 1980 Kawasaki 440 with dual mikuni carbs and a comet clutch. In order to remove the engine from the sled the clutch needs to be removed. I got the outer half of the clutch off. I can't get the inner half off. What should I do? Should the brass sheaf be stationary or is my galled on? How do I get the inner half off?