Bought a set of Beck Arnley New Old Stock ( NOS ) piston ring. The set is 87mmx3mm. The oil ring comes with an expander. However, I cannot fit the expander behind the oil ring. The groove is not deep enough. There is no way it will fit. What is it for, for piston with deeper groove? Can I do without it? This is what I think I will do. It is the ring shown in the middle of the picture.

Any ideas?

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