Are you saying you can increase tension, but the tension decreases over time? If when you screw out the rods the pistons move and will set to one of the three tensioning lines then the unit is working. If the tension decreases overtime this is also normal as your cock is elongating into the stretch. The rods can be turned out again to maintain original tension setting.
I am more referring to inconsistent tension because the chinese copy of proextender has many tiny treads. I can’t count or put a mark using fingernails on what I used the other day so I am more relying on what I feel is enough stretch. I really want help on which extender to use to replace my existing one.