diff --git a/common.scad b/common.scad
index 01554d9..6433b8c 100644
--- a/common.scad
+++ b/common.scad
@@ -1,3 +1,4 @@
+PBass_Scale_mm = 865;  // Actually 34inch = 864.6mm
 Fender_Scale_mm = 648;  // Actually 25.5inch = 647.7mm
 Classical_Normal_Scale_mm = 650;  // about 25.59inch
 Classical_Short_Scale_mm = 635;  // = 25inch
@@ -63,6 +64,12 @@ module screw_hole_lobe(ID, OD, lobes=3, fn=90) {
 	}
 }
 
+module cylinder_outer(d, h, fn) {
+	// Regular circle inscribes, this circumscribes
+	fudge = 1/cos(180/fn);
+	cylinder(d=d*fudge, h=h, $fn=fn);
+}
+
 module cylinder_beak(d, h, beak=0.75) {
 	// A cylinder with a beak to take seams. This helps improve tolerances as seams often expand a little bit and ruin the fit.
 	cylinder(d=d, h=h);