Bathtub drain cable length
I have a European bathtub drain that is the cable type. For 7 years I've had problems with the drain plug opening. It always seemed to sink lower, despite redoing the threaded drain post adjustment many times. To make it short, I've disassembled everything I can and conclude that the cable is too long. When the twist open/closed knob is in the full closed position and the up/down lever that controls the plug opening is in the full drain closed position, the cable "buckles" because it has nowhere to go; the lever has reached the full closed position. Thus, when I then twist the controller to full open, first the cable slack is taken up then there is but very little cable movement, leaving the up/down lever in a very short up position. What this translates into is that, with water in the tub, I have to get my fingernail under the plug opening while twisting the knob to full open to pry it upwards to drain the water. I can't figure out how to make the cable just a tad shorter. Can you help please?
Thanks.