I've been working on my '75 CB400F carbs under the advice of wiser board members (see previous posts). I was reassembling the carb and I couldn't find a little metal bit with concave ends that sits between the spring on the slide arm and the ball joint of the carb arm linkage. I can't seem to find a replacement part anywhere (4into1, DSS, etc.). Anyone have any idea where I might be able to find one, and if one can't be found, are there any alternatives? Thanks!