Basically YES.
If you imagine the end float on the crank, if you pull it towards you, the clutch backpalte comes with it because it is attached firmly on the taper.
If you then hit the end of the puller, the WHOLE lot would move back to where it started.
But if you put something behind the clutch backplate, then, when you hit the puller, the backplate will want to stay where it is and the crank and puller will want to go where the hammer is trying to persuade it to go, thus releasing the taper.
The end float is only small but it is enough to work with.
That's the theory anyway. Always works for me.
The heat, the cat and patience helps.
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