Yes grab a zerk fitting, lightly drill until the ball releases from the zerk and you get both the ball and the spring. If you have the brass float BS34s go buy a metric 90 degree zerk from the auto store the drilled out zerk can be threaded in place of the drain plug, push a piece of clear plastic tubing on it and you have a fuel level check tool. Setting the floats with a ruler is a first step, checking the fuel level with a sight gauge often shows up the cause of carb issues.