A method for manufacturing a driveshaft assembly takes advantage of the asymmetrical nature of the driveshaft tube and end fittings to reduce the initial imbalance of the driveshaft assembly. The operation of the secure connection may be transparent to the guest system such that guest system may send and receive messages that are encrypted or decrypted by the support system, such as a hypervisor. For example, the doll may characterize a tactile input as a slap, a tickle, a rub, a pinch, etc. It is tangentially introduced into the lower classifying chamber, initially flows through the countercurrent classifier, through the gaps between the blades of the centrifugal classifier and then into the separating cyclone before being returned to the blower. The viscosity index value is calculated and set so that the slower the pace at which the measured hydraulic pressure rises, the higher the viscosity indicated by the viscosity index value. This can maintain the input portion vertical or horizontal, for example.