A rocker arm (10, 11, 12), comprising: a hydraulic capsule (600; 701, 702), comprising: a hollow capsule body (606; 710) comprising a latch groove and a hydraulic port in fluid communication with the latch groove, the hollow capsule body comprising: a plunger (200, 720); a latch set (640; 740) alignable with the latch groove, the latch set configured to reciprocate in the capsule body (606; 710) and switch between a latched condition and an unlatched condition; and a latch-setting insert (300, 718) in the hollow capsule body (606; 710), the latch-setting insert positioning the latch set (640; 740) with respect to the latch groove, the plunger (200, 720, 726) configured to push the latch set towards the latch-setting insert; a cam side arm comprising a bearing surface, a cam-side pivot extension, and a plunger set seat arranged in a triangular configuration; and a valve side arm (500, 501, 502), comprising: a rocker shaft bore for mounting to a rocker shaft; a valve side pivot extension pivotably connected to the cam side pivot extension; a capsule mount (100; 101; 102) comprising a capsule bore (110; 120; 130) seating the hydraulic capsule (600; 701, 702) and comprising an end face (111; 121; 131) in the capsule bore; a lost motion spring (80, 81, 719) biased between the end face (111; 121; 131) and the latch-setting insert (300, 718); and an arm extension (55; 1055; 2055) extending from the rocker shaft, the arm extension configured to couple to a valve arrangement (910, 920); and a spring guide adjoining the end face, the spring guide comprising a travel stop for restricting travel of the latch-setting insert (300, 718). a plunger (200, 720); a latch set (640; 740) alignable with the latch groove, the latch set configured to reciprocate in the capsule body (606; 710) and switch between a latched condition and an unlatched condition; and a latch-setting insert (300, 718) in the hollow capsule body (606; 710), the latch-setting insert positioning the latch set (640; 740) with respect to the latch groove, the plunger (200, 720, 726) configured to push the latch set towards the latch-setting insert; a cam side arm comprising a bearing surface, a cam-side pivot extension, and a plunger set seat arranged in a triangular configuration; and a valve side arm (500, 501, 502), comprising: a rocker shaft bore for mounting to a rocker shaft; a valve side pivot extension pivotably connected to the cam side pivot extension; a capsule mount (100; 101; 102) comprising a capsule bore (110; 120; 130) seating the hydraulic capsule (600; 701, 702) and comprising an end face (111; 121; 131) in the capsule bore; a lost motion spring (80, 81, 719) biased between the end face (111; 121; 131) and the latch-setting insert (300, 718); and an arm extension (55; 1055; 2055) extending from the rocker shaft, the arm extension configured to couple to a valve arrangement (910, 920); and a rocker shaft bore for mounting to a rocker shaft; a valve side pivot extension pivotably connected to the cam side pivot extension; a capsule mount (100; 101; 102) comprising a capsule bore (110; 120; 130) seating the hydraulic capsule (600; 701, 702) and comprising an end face (111; 121; 131) in the capsule bore; a lost motion spring (80, 81, 719) biased between the end face (111; 121; 131) and the latch-setting insert (300, 718); and an arm extension (55; 1055; 2055) extending from the rocker shaft, the arm extension configured to couple to a valve arrangement (910, 920); and a spring guide adjoining the end face, the spring guide comprising a travel stop for restricting travel of the latch-setting insert (300, 718).