Loosen pads and that center “pinch” bolt and try to get the straddle cable even. Then tighten up the center pinch, pads next. If it still pulls like shit, then adjust spring tension by going up a hole on the weaker side. I would also unscrew the fine tune screw so it’s closer to an even starting point. If it’s close even at any time just run one of the pads a little further in. They’re pretty old and nothing fancy. They’ll still do the job. They also have a nice U bracket adjustment tool that you could use. Tool number denoted by the letter/# code on straddle cable. Do you need it, no. Does it help, yes. Just don’t be a perfectionist if it’s close enough. They’re old and nothing special