Fire Engine Black Dragonfly - Adjustable stroke lengths Choose between three stroke lengths. 2.6mm, 3.7mm and 4.5mm with the same eccenter. Delivered with 3.7mm stroke. *Tool kit is needed (included) to adjust the stroke length. See manual for more info. Easy to convert between standard and cartridge needles. When using cartridges the Stay up spring must be removed to prevent strain on the motor and to function properly. The X2 version has a lid in the frame that allows quick access to the Stay up spring. More stable give adjustment New Cap with built in damper prevents clatter and excessive noise when using the softer give settings. Allows to use the whole 3 turns adjustment efficiently and without clatter. Benefits - Lightweight (80 grams) Silent Low vibrating Ergonomic No need for rubberbands Adjustable hitting force Adjustable stroke length Accepts standard grips, tubes and needles.