A suspension assembly for suspending a tub in a washing machine appliance includes a damper assembly. The damper assembly includes a capsule, the capsule including a body extending between a first end and a second end along a longitudinal axis and defining an interior, the first end defining an opening of the interior. The damper assembly further includes a cap connectable to the capsule at the first end of the capsule. The cap includes a body which defines a central bore hole extending along the longitudinal axis and a cavity surrounding the central bore hole. The cap further includes a tapered ridge extending from a surface defining the cavity, the tapered ridge tapering towards and bordering the central bore hole.