The fyywheel is on a taper, so there is a service tool to remove it, the early 372XP has a 14mm flywheel securing nut, this flywheel requires service tool 502514902, the crank has a normal wood ruff key, the later 372XP has a 13mm flywheel securing nut, this flywheel has an integral alloy key within the flywheel its self, there is a much simpler knock off service tool for removal 502519401.
Hope this answers your question.
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