Robert E. Davis

I purchased the LEKI Sierra Photo (with Super Lock & Soft Anti Shock + wooden knob top piece)several years ago. Within two years the middle section would not lock in place but slide down the shaft until it hits the bottom segment. I purchased a plastic "gripper" insert at REI last year, but it still will not stay in place.nnI have two Leki short canes that collapse for travel, but they both are a couple inches too short for me. I have had 9 knee operations + a replacement knee a few years ago and need the additional length of a walking stick.nnMy 15 year old TREKS walking staff still locks in place with depressions every inch their button locks in place.nnPlease advise what I can do to correct this.nn717-802-5430