A quick learner from Chicago says:
May 13, 2016
I have a channel balance that is beige, not ribbed, 7/32" deep, 9/16" wide and is stamped 30TG. The end is partially broken off so I can't tell exactly what it should look like. The other end has no fitting, just a hole in the face about 1/4" from end. Can you identify the balance with just this info?
Paul from SWISCO responded:
May 17, 2016
I'm not sure what balance this is, either. It could be our Series 770 but I can't tell. Do you have a picture of the clip or shoe at the end of the cord?