why, are they getting stiff? What I would recommend (what I did) was to get some heavy duty rubber gloves from walmart or something. then cut a couple of the fingers off about 1.5" down from the tip. Then cut a hole in the top and slide it over your rods and move them all the way down to the base. next just zip tie them so they don't get torn or come loose. This will offer amazing protection for your ball joints and not allow grit to get in there and wear them out, plus, you shouldn't ever need lubrication if you do this. I have had mine for about 8-12 months and have never lubricated them. They are working just fine and I sharpen ppl's knives all the time on it.