A rocker arm , 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 ; 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 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 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 , 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 biased between the end face (111; 121; 131) and the latch-setting insert ; and an arm extension (55; 1055; 2055) extending from the rocker shaft , the arm extension configured to couple to a valve arrangement ; and a spring guide adjoining the end face , the spring guide comprising a travel stop for restricting travel of the latch-setting insert . a plunger ; 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 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 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 , 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 biased between the end face (111; 121; 131) and the latch-setting insert ; and an arm extension (55; 1055; 2055) extending from the rocker shaft , the arm extension configured to couple to a valve arrangement ; 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 biased between the end face (111; 121; 131) and the latch-setting insert ; and an arm extension (55; 1055; 2055) extending from the rocker shaft , the arm extension configured to couple to a valve arrangement ; and a spring guide adjoining the end face , the spring guide comprising a travel stop for restricting travel of the latch-setting insert . <EOS>