Really dumb question.......I am trying to bleed the brakes on my '89 Bronco. Was able to do the back ones-but-when I moved to the front ones the bleeder tool would not fit--to small. I have tried every size the stores have, even metric but can't find on that will fit properly. The fittings are not damaged and I have tried both sides. Not sure what else to try short of using a set of vise grips on them..any suggestions ? Thanks.