diff --git a/include/hexagram/dial.h b/include/hexagram/dial.h
index 65c5ad7..3e420e3 100644
--- a/include/hexagram/dial.h
+++ b/include/hexagram/dial.h
@@ -51,11 +51,7 @@ int hexagram_dial_draw_mark(hexagram_dial *dial,
                             double max_radius,
                             double value);
 
-int hexagram_dial_draw_needle(hexagram_dial *dial,
-                              cairo_t *cr,
-                              double min_radius,
-                              double max_radius,
-                              double value);
+int hexagram_dial_draw_needle(hexagram_dial *dial, cairo_t *cr, double value);
 
 int hexagram_dial_draw_bg(hexagram_dial *dial, cairo_t *cr);
 
diff --git a/src/dial.c b/src/dial.c
index 35a48eb..fb64c25 100644
--- a/src/dial.c
+++ b/src/dial.c
@@ -8,8 +8,17 @@
 
 #define DIAL_MAIN_BEZEL_WIDTH 16
 
-#define DIAL_LEGEND_RADIUS_MAIN   0.675
-#define DIAL_LEGEND_RADIUS_BOTTOM 0.725
+#define DIAL_RADIUS_LEGEND_MAIN   0.675
+#define DIAL_RADIUS_LEGEND_BOTTOM 0.725
+
+#define DIAL_RADIUS_NEEDLE_MAIN_MIN 0.5
+#define DIAL_RADIUS_NEEDLE_MAIN_MAX 0.89
+
+#define DIAL_RADIUS_NEEDLE_MAIN_MIN 0.5
+#define DIAL_RADIUS_NEEDLE_MAIN_MAX 0.89
+
+#define DIAL_RADIUS_NEEDLE_BOTTOM_MIN 0.8
+#define DIAL_RADIUS_NEEDLE_BOTTOM_MAX 0.9
 
 static inline double _min(double a, double b) {
     return a < b?
@@ -81,7 +90,6 @@ static int main_draw_bg(hexagram_gauge *gauge, cairo_t *cr) {
 
 static int main_draw_fg(hexagram_gauge *gauge, cairo_t *cr) {
     hexagram_dial *dial = (hexagram_dial *)gauge;
-
     double angle = hexagram_dial_angle(dial, dial->value);
 
     cairo_set_line_width(cr, dial->radius * 0.375);
@@ -96,7 +104,7 @@ static int main_draw_fg(hexagram_gauge *gauge, cairo_t *cr) {
 
     cairo_stroke(cr);
 
-    hexagram_dial_draw_needle(dial, cr, 0.5, 0.89, dial->value);
+    hexagram_dial_draw_needle(dial, cr, dial->value);
 
     return 0;
 }
@@ -122,10 +130,7 @@ static int bottom_draw_bg(hexagram_gauge *gauge, cairo_t *cr) {
 static int bottom_draw_fg(hexagram_gauge *gauge, cairo_t *cr) {
     hexagram_dial *dial = (hexagram_dial *)gauge;
 
-    double min_radius = 0.8,
-           max_radius = 0.9;
-
-    return hexagram_dial_draw_needle(dial, cr, min_radius, max_radius, dial->value);
+    return hexagram_dial_draw_needle(dial, cr, dial->value);
 }
 
 int hexagram_dial_init(hexagram_dial *dial,
@@ -206,8 +211,8 @@ int hexagram_dial_draw_legend(hexagram_dial *dial,
     cairo_text_extents_t extents;
 
     double radius = dial->type == HEXAGRAM_DIAL_MAIN?
-        DIAL_LEGEND_RADIUS_MAIN:
-        DIAL_LEGEND_RADIUS_BOTTOM;
+        DIAL_RADIUS_LEGEND_MAIN:
+        DIAL_RADIUS_LEGEND_BOTTOM;
 
     cairo_text_extents(cr, text, &extents);
 
@@ -241,12 +246,15 @@ int hexagram_dial_draw_mark(hexagram_dial *dial,
     return 0;
 }
 
-int hexagram_dial_draw_needle(hexagram_dial *dial,
-                              cairo_t *cr,
-                              double min_radius,
-                              double max_radius,
-                              double value) {
-    double angle = hexagram_dial_angle(dial, value);
+int hexagram_dial_draw_needle(hexagram_dial *dial, cairo_t *cr, double value) {
+    double angle      = hexagram_dial_angle(dial, value),
+           min_radius = DIAL_RADIUS_NEEDLE_MAIN_MIN,
+           max_radius = DIAL_RADIUS_NEEDLE_MAIN_MAX;
+
+    if (dial->type == HEXAGRAM_DIAL_BOTTOM) {
+        min_radius = DIAL_RADIUS_NEEDLE_BOTTOM_MIN;
+        max_radius = DIAL_RADIUS_NEEDLE_BOTTOM_MAX;
+    }
 
     cairo_set_source_rgba(cr, 1, 0.4, 1, 0.75);
     cairo_set_line_width(cr, 8);