67. A wife at any time after alimony has been allotted to her, whether it be alimony pending suit or permanent alimony, may file her petition supported by affidavit for an increase of the alimony allotted, by reason of the increased means of the husband or the reduction of her own means. A husband may file a petition supported by affidavit for a reduction of the alimony allotted, by reason of his reduced means or the wife’s increased means. The course of proceeding in such cases shall be the same as required by these rules in respect of the original petition for alimony and the allotment thereof.