diff --git a/THREAD_TABLE.scad b/THREAD_TABLE.scad
index 49c8651..8a57d1d 100644
--- a/THREAD_TABLE.scad
+++ b/THREAD_TABLE.scad
@@ -1902,24 +1902,24 @@ THREAD_TABLE = [
 ["32-UN-13/16-int", [0.79375, -10.3492, 20.6914, [[0, 0.3473], [0, -0.3473], [0.4296, -0.0992], [0.4296, 0.0992]]]],
 ["RMS-ext", [0.7056, 9.5829, 19.1859, [[0.0, -0.3274], [0.0, 0.3273], [0.4932, 0.0706], [0.4932, -0.0706]]]],
 ["RMS-int", [0.7055, -10.3042, 20.5085, [[0.0, 0.2630], [0.0, -0.2630], [0.4808, -0.0127], [0.4808, 0.0127]]]],
-["PG7-ext", [1.27, 5.640000, 11.280000, [[0, -0.5797], [0, 0.5797], [0.7568, 0.0757], [0.7568, -0.0757]]]],
+["PG7-ext", [1.27, 5.640000, 11.280000, [[-0.0001, -0.5797], [-0.0001, 0.5797], [0.7568, 0.0757], [0.7568, -0.0757]]]],
 ["PG7-int", [1.27, -6.250000, 12.500000, [[0, 0.5797], [0, -0.5797], [0.7568, -0.0757], [0.7568, 0.0757]]]],
-["PG9-ext", [1.4112, 6.930000, 13.860000, [[0, -0.6441], [0, 0.6441], [0.8408, 0.0841], [0.8408, -0.0841]]]],
+["PG9-ext", [1.4112, 6.930000, 13.860000, [[-0.0001, -0.6441], [-0.0001, 0.6441], [0.8408, 0.0841], [0.8408, -0.0841]]]],
 ["PG9-int", [1.4112, -7.600000, 15.200000, [[0, 0.6441], [0, -0.6441], [0.8408, -0.0841], [0.8408, 0.0841]]]],
-["PG11-ext", [1.4112, 8.630000, 17.260000, [[0, -0.6441], [0, 0.6441], [0.8408, 0.0841], [0.8408, -0.0841]]]],
+["PG11-ext", [1.4112, 8.630000, 17.260000, [[-0.0001, -0.6441], [-0.0001, 0.6441], [0.8408, 0.0841], [0.8408, -0.0841]]]],
 ["PG11-int", [1.4112, -9.300000, 18.600000, [[0, 0.6441], [0, -0.6441], [0.8408, -0.0841], [0.8408, 0.0841]]]],
-["PG13.5-ext", [1.4112, 9.530000, 19.060000, [[0, -0.6441], [0, 0.6441], [0.8408, 0.0841], [0.8408, -0.0841]]]],
+["PG13.5-ext", [1.4112, 9.530000, 19.060000, [[-0.0001, -0.6441], [-0.0001, 0.6441], [0.8408, 0.0841], [0.8408, -0.0841]]]],
 ["PG13.5-int", [1.4112, -10.200000, 20.400000, [[0, 0.6441], [0, -0.6441], [0.8408, -0.0841], [0.8408, 0.0841]]]],
-["PG16-ext", [1.4112, 10.580000, 21.160000, [[0, -0.6441], [0, 0.6441], [0.8408, 0.0841], [0.8408, -0.0841]]]],
+["PG16-ext", [1.4112, 10.580000, 21.160000, [[-0.0001, -0.6441], [-0.0001, 0.6441], [0.8408, 0.0841], [0.8408, -0.0841]]]],
 ["PG16-int", [1.4112, -11.250000, 22.500000, [[0, 0.6441], [0, -0.6441], [0.8408, -0.0841], [0.8408, 0.0841]]]],
-["PG21-ext", [1.5875, 13.390000, 26.780000, [[0, -0.7246], [0, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
+["PG21-ext", [1.5875, 13.390000, 26.780000, [[-0.0001, -0.7246], [-0.0001, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
 ["PG21-int", [1.5875, -14.150000, 28.300000, [[0, 0.7246], [0, -0.7246], [0.9460, -0.0946], [0.9460, 0.0946]]]],
-["PG29-ext", [1.5875, 17.740000, 35.480000, [[0, -0.7246], [0, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
+["PG29-ext", [1.5875, 17.740000, 35.480000, [[-0.0001, -0.7246], [-0.0001, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
 ["PG29-int", [1.5875, -18.500000, 37.000000, [[0, 0.7246], [0, -0.7246], [0.9460, -0.0946], [0.9460, 0.0946]]]],
-["PG36-ext", [1.5875, 22.740000, 45.480000, [[0, -0.7246], [0, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
+["PG36-ext", [1.5875, 22.740000, 45.480000, [[-0.0001, -0.7246], [-0.0001, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
 ["PG36-int", [1.5875, -23.500000, 47.000000, [[0, 0.7246], [0, -0.7246], [0.9460, -0.0946], [0.9460, 0.0946]]]],
-["PG42-ext", [1.5875, 26.240000, 52.480000, [[0, -0.7246], [0, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
+["PG42-ext", [1.5875, 26.240000, 52.480000, [[-0.0001, -0.7246], [-0.0001, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
 ["PG42-int", [1.5875, -27.000000, 54.000000, [[0, 0.7246], [0, -0.7246], [0.9460, -0.0946], [0.9460, 0.0946]]]],
-["PG48-ext", [1.5875, 28.890000, 57.780000, [[0, -0.7246], [0, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
+["PG48-ext", [1.5875, 28.890000, 57.780000, [[-0.0001, -0.7246], [-0.0001, 0.7246], [0.9460, 0.0946], [0.9460, -0.0946]]]],
 ["PG48-int", [1.5875, -29.650000, 59.300000, [[0, 0.7246], [0, -0.7246], [0.9460, -0.0946], [0.9460, 0.0946]]]],
 ];
diff --git a/design/PG_electrical_thread.awk b/design/PG_electrical_thread.awk
index 01773be..de0b240 100644
--- a/design/PG_electrical_thread.awk
+++ b/design/PG_electrical_thread.awk
@@ -14,7 +14,7 @@ function calculateThreadlibSpecs() {
 
 	RrotExt = InnerDiam / 2;
 	DSupportExt = InnerDiam;
-	drRootExt = 0;
+	drRootExt = -0.0001;
 	dzRootExt = cos(40*Pi/180)*H;
 	drCrestExt = H;
 	dzCrestExt = H*.1;
@@ -46,7 +46,7 @@ BEGIN {
 	printf	"%.4f,", drCrestExt			# r2
 	printf	"%.4f,", dzCrestExt			# z2
 	printf	"%.4f,", drCrestExt			# r3
-	printf	"%.4f\n", -dzCrestExt;			# z3
+	printf	"%.4f\n", -dzCrestExt			# z3
 
 	# Internal thread:
 	printf	Designator "-int,"			# designator
@@ -60,5 +60,5 @@ BEGIN {
 	printf	"%.4f,", drCrestInt			# r2
 	printf	"%.4f,", -dzCrestInt			# z2
 	printf	"%.4f,", drCrestInt			# r3
-	printf	"%.4f\n", dzCrestInt;			# z3
+	printf	"%.4f\n", dzCrestInt			# z3
 }