â‘ the size of the crown; large expression head easier to rotate the upper, while the smaller is easy to slip. â‘¡ the degree of tightness between the crown and the handle of the case; if it is tight, the same is not easy winding. â‘¢ winding gear rotation ratio; if the movement of the Department of gear system is different, the transmission ratio is not the same, including the vertical wheel, a small steel wheel and the number of steel wheel gear, so winding rate is not the same. â‘£ the number of winding laps affect the working hours of the winding laps are usually around 6-10 laps, the number of laps, winding the number will increase. Under normal circumstances, as long as the rotation can be thirty full string, and usually can not earn too tight, the right amount can, if made too tight, may even affect the performance of the movement.