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Why do you believe it needs to be adjusted so often? Is the engine running poorly, is the distributor actually twisting/turning or is it like I suspect and just the timing mark on the damper moving? If like I suspect and the timing mark on the damper moving, that is what is called "damper dancing". The rubber piece between the 2 parts of the damper is bad and is causing the 2 pieces to move in relationship to eachother. If this is the case, replace the damper.
If not, let me know the year, make and model also.