diff --git a/balun.scad b/balun.scad
index 8bbd6bd..47f9f79 100644
--- a/balun.scad
+++ b/balun.scad
@@ -11,7 +11,7 @@ depth=30;
 wall=2;
 
 // Cover Screw Diameter (clearance)
-cover_screw_diameter=3.5;
+cover_screw_diameter=4;
 
 // Heat-press insert height
 insert_height=5;
@@ -166,7 +166,7 @@ module hanging_tab(
  * Describes clearance holes for a SO-239 connector
  */
 module so_239_mount(
-  center_diameter = 15,
+  center_diameter = 16,
   bolt_spacing    = 18,
   bolt_diameter   = 3.5,
   height          = 10