diff --git a/split_reel.scad b/split_reel.scad
index 1a09458..ef5c5a4 100644
--- a/split_reel.scad
+++ b/split_reel.scad
@@ -4,13 +4,14 @@ include <./common/threads.scad>;
 Core16mm = 25.5;
 PlatterThickness = 1.6;
 Platter120m = 178;
+Thread16mmD = 17.5;
 
 module thread_16mm ( pos = [0, 0, 0], length = 11, chamfer = false, pad = 0) {
     translate(pos) {
         if (chamfer) {
-           metric_thread (diameter=18.5, pitch=1.5, length=length, internal=false, n_starts=1, thread_size=-1, groove=false, square=false, rectangle=0, angle=30, taper=0, leadin=2, leadfac=1.5);
+           metric_thread (diameter=Thread16mmD, pitch=1.5, length=length, internal=false, n_starts=1, thread_size=-1, groove=false, square=false, rectangle=0, angle=30, taper=0, leadin=2, leadfac=1.5);
         } else {
-            metric_thread (diameter=18.5, pitch=1.5, length=length, internal=false, n_starts=1, thread_size=-1, groove=false, square=false, rectangle=0, angle=30, taper=0, leadin=0, leadfac=1.5);
+            metric_thread (diameter=Thread16mmD, pitch=1.5, length=length, internal=false, n_starts=1, thread_size=-1, groove=false, square=false, rectangle=0, angle=30, taper=0, leadin=0, leadfac=1.5);
         }
     }
 }
@@ -78,7 +79,7 @@ module split_reel (format = "16mm", length = 120, half = "A") {
     }
 }
 
-PART = "split_reel_16mm_120m_A";
+PART = "split_reel_16mm_120m_B";
 
 if (PART == "split_reel_16mm_120m_A") {
     split_reel("16mm", 120, "A");