There are two types of retaining rings, or circlips, internal and external. The best way to identify which is which is to look at the tabs where the tool pins go. If they're on the inside of the circlip, then it's an internal circlip or snap ring. If they're on the outside, they're external. Pretty simple, right? The two types require different tools. Internal circlips are squeezed to free them (or install them) from their slot while external retaining rings are spread open.
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