If you have never done one before it can seem tricky. Remember the thing is lightly spring loaded and can pop open when you remove the circlip. It is hard for the first timer to rotate the helix one tower, line up and install the keyway then washer and all while holding down against the spring, put the circlip back on. proper tools make it a breeze. or an extra set of hands can help till you can do it your self. That year of clutch might have the holes drilled to push out the buttons if not you will think of something to dig em out with.
To get the buttons out...drill a tiny hole in the center of button, then insert a wood screw, or any screw and just pull it out. Quick and easy. I agree with Hotrod, you'll need another pair of hands if it's your first time. Also, it may be a good idea to make a mark on both sheaves before dismantling it, so that they go back together the same to help keep the clutch balanced.
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