Index: trunk/src/change.c
===================================================================
--- trunk/src/change.c	(revision 12778)
+++ trunk/src/change.c	(revision 12779)
@@ -62,7 +62,7 @@
 	NULL,
 	NULL,
 	pcb_subcop_change_size,
-	NULL  /* padstack */
+	pcb_pstkop_change_size
 };
 
 pcb_opfunc_t Change1stSizeFunctions = {
Index: trunk/src/change.h
===================================================================
--- trunk/src/change.h	(revision 12778)
+++ trunk/src/change.h	(revision 12779)
@@ -42,7 +42,7 @@
 	(PCB_TYPE_VIA | PCB_TYPE_PSTK | PCB_TYPE_PIN | PCB_TYPE_PAD | PCB_TYPE_TEXT | PCB_TYPE_ELEMENT | PCB_TYPE_SUBC | PCB_TYPE_ELEMENT_NAME | PCB_TYPE_LINE | PCB_TYPE_ARC | PCB_TYPE_POLY | PCB_TYPE_SUBC_PART | PCB_TYPE_SUBC)
 
 #define	PCB_CHANGESIZE_TYPES        \
-	(PCB_TYPE_POLY | PCB_TYPE_VIA | PCB_TYPE_PIN | PCB_TYPE_PAD | PCB_TYPE_LINE | \
+	(PCB_TYPE_PSTK | PCB_TYPE_POLY | PCB_TYPE_VIA | PCB_TYPE_PIN | PCB_TYPE_PAD | PCB_TYPE_LINE | \
 	 PCB_TYPE_ARC | PCB_TYPE_TEXT | PCB_TYPE_ELEMENT_NAME | PCB_TYPE_ELEMENT | PCB_TYPE_SUBC | PCB_TYPE_SUBC_PART )
 
 #define	PCB_CHANGE2NDSIZE_TYPES     \
Index: trunk/src/obj_pstk.h
===================================================================
--- trunk/src/obj_pstk.h	(revision 12778)
+++ trunk/src/obj_pstk.h	(revision 12779)
@@ -137,7 +137,10 @@
 /* Deep copy a prototype */
 void pcb_pstk_proto_copy(pcb_pstk_proto_t *dst, const pcb_pstk_proto_t *src);
 
+/* grow (or shrink) a prototype to or by offs - change the proto in place */
+void pcb_pstk_proto_grow(pcb_pstk_proto_t *proto, pcb_bool is_absolute, pcb_coord_t offs);
 
+
 /*** hash ***/
 unsigned int pcb_pstk_hash(const pcb_pstk_proto_t *p);
 int pcb_pstk_eq(const pcb_pstk_proto_t *p1, const pcb_pstk_proto_t *p2);
Index: trunk/src/obj_pstk_op.c
===================================================================
--- trunk/src/obj_pstk_op.c	(revision 12778)
+++ trunk/src/obj_pstk_op.c	(revision 12779)
@@ -187,3 +187,23 @@
 	return NULL;
 }
 
+void *pcb_pstkop_change_size(pcb_opctx_t *ctx, pcb_pstk_t *ps)
+{
+	pcb_pstk_proto_t proto;
+	pcb_cardinal_t nproto;
+
+	/* create the new prototype and insert it */
+	pcb_pstk_proto_copy(&proto, pcb_pstk_get_proto(ps));
+	pcb_pstk_proto_grow(&proto, ctx->chgsize.is_absolute, ctx->chgsize.value);
+	nproto = pcb_pstk_proto_insert_dup(ps->parent.data, &proto, 1);
+	pcb_pstk_proto_free_fields(&proto);
+
+	if (nproto == PCB_PADSTACK_INVALID)
+		return NULL;
+
+	if (pcb_pstk_change_instance(ps, &nproto, NULL, NULL, NULL) == 0)
+		return ps;
+
+	return NULL;
+}
+
Index: trunk/src/obj_pstk_op.h
===================================================================
--- trunk/src/obj_pstk_op.h	(revision 12778)
+++ trunk/src/obj_pstk_op.h	(revision 12779)
@@ -40,9 +40,10 @@
 
 void *pcb_pstkop_rotate90(pcb_opctx_t *ctx, pcb_pstk_t *ps);
 
+void *pcb_pstkop_change_size(pcb_opctx_t *ctx, pcb_pstk_t *ps);
 
+
 /*** TODO: unimplemented ones ***/
 
-void *pcb_pstkop_change_size(pcb_opctx_t *ctx, pcb_pstk_t *ps);
 void *pcb_pstkop_change_2nd_size(pcb_opctx_t *ctx, pcb_pstk_t *ps);
 void *pcb_pstkop_change_clear_size(pcb_opctx_t *ctx, pcb_pstk_t *ps);
Index: trunk/src/obj_pstk_proto.c
===================================================================
--- trunk/src/obj_pstk_proto.c	(revision 12778)
+++ trunk/src/obj_pstk_proto.c	(revision 12779)
@@ -613,6 +613,12 @@
 	return ts;
 }
 
+void pcb_pstk_proto_grow(pcb_pstk_proto_t *proto, pcb_bool is_absolute, pcb_coord_t offs)
+{
+
+}
+
+
 /*** hash ***/
 static unsigned int pcb_pstk_shape_hash(const pcb_pstk_shape_t *sh)
 {