hero blobs are on the end of the footpegs on a motorbike they are the small screw on bits underneath.your stand may be bent or the rear supsension may have gone weak or like bob says the spring may have lost is temper on the stand return spring and gone weak.flat tyres wont help it though check them and set them to 32 psi rear and 28 psi front.
adam bike doctor, March 2010