The Model 987 can be manufactured in either of two technical designs: 1) positive pay-off and compensated control of tension by operating the torque motor with the flow of the yarn path. 2) tension controlled un-winding of fibers and yarns by operating the torque motor against the flow of 
the yarn path. Tension to the yarn strand is applied by a pneumatic cylinder connected to each compensator arm. Central control of tension is possible by using an adjustable, single precision air regulator interconnected to all positions. The Model 987 can be manufactured to accommodate a 
wide range of core diameters and lengths. Longer distance between package and compensator panel mimimize scuffing of yarn during un-winding. For applications which do not require precise tension control, the Model 987 is also available without the tension compensation control.