centerstand rattle?

[Red9654]

on my wolf rx 50 there is a rattling noise. it happens during cruising speed (30-40 mph), i believe its coming from the center stand. when it starts to rattle i put my foot on it and apply pressure and the noise goes away and i took it completely off once and there was no noise at all that trip. the only thing is I'm not sure whats causing it. the rubber stopper is there and no part of the stand is hitting the exhaust, engine or frame. the stand doesn't feel loose when it is up either. any ideas?