diff --git a/src/components.scad b/src/components.scad
index e92fe19..8cd3547 100644
--- a/src/components.scad
+++ b/src/components.scad
@@ -40,6 +40,10 @@ top_plate_x = 175;
 top_plate_y = 200;
 top_plate_z = 5;
 
+// neutrik D screw holes
+neutrik_d_screw_radius = 1.6 + hole_tolerance;
+neutrik_d_radius = 12 + hole_tolerance;
+
 /* PARTS */
 
 module m4_hole() {
@@ -66,6 +70,20 @@ module frame_interchange_hole() {
 	cylinder(r=15, h=50, $fn=50, center=true);
 }
 
+module neutrik_d_hole() {
+	cylinder(r=neutrik_d_radius, h=100, $fn=50, center=true);
+}
+
+module neutrik_d_screw_hole() {
+	cylinder(r=neutrik_d_screw_radius, h=100, $fn=50, center=true);
+}
+
+module neutrik_d_mount() {
+	neutrik_d_hole();
+	translate([9.5, 12, 0]) neutrik_d_screw_hole();
+	translate([-9.5, -12, 0]) neutrik_d_screw_hole();
+}
+
 /* PIECES */
 
 module levermountbase() {
diff --git a/src/frame-middle.scad b/src/frame-middle.scad
new file mode 100644
index 0000000..3851af6
--- /dev/null
+++ b/src/frame-middle.scad
@@ -0,0 +1,44 @@
+/* Copyright Brian Stephan 2023
+ *
+ * This file is part of bullet-system-stick.
+ *
+ * bullet-system-stick is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * bullet-system-stick is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * bullet-system-stick. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+include <components.scad>
+
+module middle_frame() {
+	difference() {
+		frame();
+		// chop the left and right edge off
+		frame_side_chopper();
+		mirror([1, 0, 0]) frame_side_chopper();
+	}
+}
+
+difference() {
+	middle_frame();
+	// connection holes to other frames
+	frame_connection_holes();
+	mirror([1, 0, 0]) frame_connection_holes();
+
+	// cable routing holes
+	frame_cable_routing_hole();
+	mirror([1, 0, 0]) frame_cable_routing_hole();
+
+	// neutrik mounts for connector, switches
+	translate([0, 100, 0]) rotate([90, 0, 0]) neutrik_d_mount();
+	translate([-40, 100, 0]) rotate([90, 0, 0]) neutrik_d_mount();
+	translate([40, 100, 0]) rotate([90, 0, 0]) neutrik_d_mount();
+}