Bicycle (adjustable) seat clamps work on any worn poles that can't be tightened any more with the factory fitted clamps owing to wear and tear in frequent clamping positions.
Have recently bought a small extreme pole with the stainless steel clamping points and might try replicating this idea on some worn SLX poles that have had the original clamps replaced with the self adjusting ones which have now almost had their day as they are adjusted to the last threads of the bolts. If I wrap some one millimetre or thinner shimming around the worn sections and glue them in place to see if they rejuvenate almost knackered poles, worth a try.