RE: CONTROL HORN LOCATIONS FOR PULL-PULL SYSTEMS
But I think that your mistake is in assuming the same angular displacement when the arms are of different lengths. The longer side in your first sketch will not actually stretch. THe length will remain the same and the longer arm rotate less, thus causing both sides to remain the same length. Certain geometries can allow slack in the side not pulling, but you won't stretch the side doing the work if you are using reliable materials.