adjustment rod 22 could be made from a flexible cable instead of a rigid component turning the tension adjust knob 11 pulls on the tension adjust rod 22 which pulls on the tension bar 21 which in turn pulls the floating tension pulley 20 up and increases the tension on the tension belt 18 the resistance adjustment mechanism 9 consists of a tension adjust rod 22 an upper 24 and lower 25 housing an index ring 26 an outer 27 and inner 28 hub two 2 compression springs 29 two 2 steel balls 30 and a shaft 31 the tension adjust rod 22 connects to the tension adjust inner hub 28 the inner hub 28 turns with the outer hub 27 the outer hub 27 has a shaft with square flat sides which couple to the tension adjust knob 11 and the index ring 26 the upper housing 24 has two holes for the tension adjust springs 29 and the steel balls 30 the index ring 26 sits on top of the spring compressed steel balls 30 and has a series of hole perforations which the steel balls 30 engage resulting in discreet tension settings alternatively the steel balls 30 could be made from plastic ceramic or other suitable material and the number of balls 2 could be less or more depending on what is required to sufficiently keep the tension adjust knob in its set position.