Index: trunk/src/change.c
===================================================================
--- trunk/src/change.c	(revision 13233)
+++ trunk/src/change.c	(revision 13234)
@@ -134,7 +134,7 @@
 	NULL,
 	NULL,
 	pcb_subcop_change_clear_size,
-	NULL  /* padstack */
+	pcb_pstkop_change_clear_size
 };
 
 static pcb_opfunc_t ChangeNameFunctions = {
Index: trunk/src/obj_pstk_op.c
===================================================================
--- trunk/src/obj_pstk_op.c	(revision 13233)
+++ trunk/src/obj_pstk_op.c	(revision 13234)
@@ -253,7 +253,29 @@
 	return NULL;
 }
 
+void *pcb_pstkop_change_clear_size(pcb_opctx_t *ctx, pcb_pstk_t *ps)
+{
+	pcb_coord_t value = (ctx->chgsize.is_absolute) ? ctx->chgsize.value : ps->Clearance + ctx->chgsize.value;
 
+	if (PCB_FLAG_TEST(PCB_FLAG_LOCK, ps))
+		return NULL;
+	if (value < 0)
+		value = 0;
+	value = MIN(PCB_MAX_LINESIZE, value);
+	if (!ctx->chgsize.is_absolute && (ctx->chgsize.value < 0) && (value < PCB->Bloat * 2))
+		value = 0;
+	if ((ctx->chgsize.value > 0) && (value < PCB->Bloat * 2))
+		value = PCB->Bloat * 2 + 2;
+	if (ps->Clearance == value)
+		return NULL;
+
+	if (pcb_pstk_change_instance(ps, NULL, &value, NULL, NULL) == 0)
+		return ps;
+
+	return NULL;
+}
+
+
 void *pcb_pstkop_change_2nd_size(pcb_opctx_t *ctx, pcb_pstk_t *ps)
 {
 	pcb_pstk_proto_t proto;
Index: trunk/src/obj_pstk_op.h
===================================================================
--- trunk/src/obj_pstk_op.h	(revision 13233)
+++ trunk/src/obj_pstk_op.h	(revision 13234)
@@ -42,6 +42,7 @@
 void *pcb_pstkop_rotate(pcb_opctx_t *ctx, pcb_pstk_t *ps);
 
 void *pcb_pstkop_change_size(pcb_opctx_t *ctx, pcb_pstk_t *ps);
+void *pcb_pstkop_change_clear_size(pcb_opctx_t *ctx, pcb_pstk_t *ps); /* changes the global clearance */
 void *pcb_pstkop_change_2nd_size(pcb_opctx_t *ctx, pcb_pstk_t *ps);
 
 /*** TODO: unimplemented ones ***/