Hola, there is a bug in RTArrowedLine: the width: message (defined in the RTAbstractArrowedLine superclass) does not set the width of the head. Could something like the code below be added? This code solves the problem for me. RTArrowedLine>>width: aNumber super width: aNumber. self head width: aNumber. and I imagine something similar should be done with RTDoubleArrowedLine (but I have no experience with that guy). ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD and RyCh labs - Computer Science Department (DCC) - University of Chile