Add a three hole punch peg bar design. Not as stable as the ACME punch, but way more available. With both sides punched carefully, this could be very useable.

models/three_hole_peg_bar/meta.json

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+{
+	"buy" : "https://links.sixteenmillimeter.com/qeRRdUIk"
+}

models/three_hole_peg_bar/three_hole_peg_bar.scad

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+$fn = 60;
+time = 0;
+
+L = 254;
+W = 13;
+H = 3;
+CENTER_D = 6.39;
+CENTER_H = 9.76;
+
+SIDE_D = 3.24;
+SIDE_L = 11.92;
+SIDE_SPACE = 108 * 2; 
+
+module rounded_bar (arr = [50, 10, 10], fn = 60) {
+	$fn = fn;
+	cube([arr[0] - arr[1], arr[1], arr[2]], center = true);
+	translate ([(arr[0] / 2) - (arr[1] / 2), 0, 0]) {
+		cylinder(r = arr[1] / 2, h = arr[2], center = true);
+	}
+	translate ([-(arr[0] / 2) + (arr[1] / 2), 0, 0]) {
+		cylinder(r = arr[1] / 2, h = arr[2], center = true);
+	}
+}
+
+module animation_peg_bar () {
+    rounded_bar([L, W, H], $fn);
+    translate([0, 0, (CENTER_H / 2) - .5]) round_peg(CENTER_D, CENTER_H);
+    translate([(SIDE_SPACE / 2), 0, (CENTER_H / 2) + .3 ]) round_peg(CENTER_D, CENTER_H);
+    translate([-(SIDE_SPACE / 2), 0, (CENTER_H / 2) + .3 ]) round_peg(CENTER_D, CENTER_H);
+}
+
+module round_peg (D = 6, H = 9) {
+    union () {
+        cylinder(r = D / 2, h = H - (D / 2), center = true);
+        translate([0, 0, (H / 2) - (D / 4)]) {
+            difference () {
+                sphere(r = D / 2);
+                translate([0, 0, -D]) cube([D*2, D*2, D*2], center = true);
+            }
+        }
+    }
+}
+
+module center_part () {
+    difference () {
+        intersection () {
+            animation_peg_bar(); 
+            cube([L / 3, 30, 30], center = true); 
+        }
+        translate([L / 6, 9, 13 / 2]) cube([13, 13, 13], center = true);
+        translate([L / 6, -9, -13 / 2]) cube([13, 13, 13], center = true);
+        translate([-L / 6, -9, 13 / 2]) cube([13, 13, 13], center = true);
+        translate([-L / 6, 9, -13 / 2]) cube([13, 13, 13], center = true);
+    }
+}
+
+module three_parts () {
+    translate([L / 3.2, 0, 0]) difference () {
+        animation_peg_bar();
+        center_part();
+        translate([L / 2, 0, 0]) cube([L, 30, 30], center = true);
+    }
+    translate([-L / 3.2, W + 3, 0]) difference () {
+        animation_peg_bar();
+        center_part();
+        translate([-L / 2, 0, 0]) cube([L, 30, 30], center = true);
+    }
+    translate([0, (W + 3) * 2, 0]) center_part();
+}
+
+//three_parts();
+
+rotate([0, 0, time]) animation_peg_bar();