They do/did make a hubcap tool for this.It looks like a prybar bent almost 90 deg at the end with a rubber hammer head halfway up on the opposite side of the bend.You rest the head on the tire and the prybar end on the back of the cap and give it a good smack with you hand and bingo,right off.....Check old tool suppliers at swap meets.. K-D,Lisle,or Snap-On ...maybe ebay ???
Steve
