diff --git a/printed/cable_grommets.scad b/printed/cable_grommets.scad
index ba22021..892df0d 100644
--- a/printed/cable_grommets.scad
+++ b/printed/cable_grommets.scad
@@ -158,14 +158,14 @@ module mouse_grommet_hole(r, h = 50, z = undef, expand = wall + clearance) //! M
                 square([2 * R, eps]);
         }
 
-function mouse_grommet_offset(r) = r + wall;
+function mouse_grommet_offset(r) = r + wall; //! Offset of the wire from the ground
+function mouse_grommet_length(r) = 2 * r + 2 * wall + 2 * overlap; //! Length of grommet given r
 
 module mouse_grommet(r, thickness) { //! Make the STL for a mouse grommet
 
     width = 2 * (wall + clearance) + thickness;
-    length = 2 * r + 2 * wall + 2 * overlap;
 
-    stl(str("mouse_grommet_", r * 10, "_", thickness))
+    stl(str("mouse_grommet_", r * 20, "_", thickness))
         rotate([90, 0, 0])
             union() {
                 for(side = [-1, 1])
@@ -193,10 +193,10 @@ module mouse_grommet_assembly(r, thickness)
             mouse_grommet(r, thickness);
 
 module ribbon_grommet_20_3_stl() ribbon_grommet(20, 3);
-module mouse_grommet_15_3_stl() mouse_grommet(1.5, 3);
-module mouse_grommet_20_3_stl() mouse_grommet(2, 3);
-module mouse_grommet_25_3_stl() mouse_grommet(2.5, 3);
-module mouse_grommet_30_3_stl() mouse_grommet(3, 3);
+module mouse_grommet_30_3_stl() mouse_grommet(1.5, 3);
+module mouse_grommet_40_3_stl() mouse_grommet(2, 3);
+module mouse_grommet_50_3_stl() mouse_grommet(2.5, 3);
+module mouse_grommet_60_3_stl() mouse_grommet(3, 3);
 
 module round_grommet_bottom_30_stl() round_grommet_bottom(3);
 module round_grommet_bottom_40_stl() round_grommet_bottom(4);
diff --git a/readme.md b/readme.md
index 9abf542..fa9a0e9 100644
--- a/readme.md
+++ b/readme.md
@@ -4337,8 +4337,8 @@ Just a BOM entry at the moment and cable bundle size functions for holes, plus c
 | `cable_radius(cable)` | Radius of a bundle of wires, see <http://mathworld.wolfram.com/CirclePacking.html>. |
 | `cable_width(cable)` | Width in flat clip |
 | `cable_wire_size(cable)` | Size of each wire in a bundle |
-| `cable_wires(cable)` | Number of wires in a bindle |
-| `wire_hole_radius(cable)` | Radius of a hole to accept a bundle of wires |
+| `cable_wires(cable)` | Number of wires in a bundle |
+| `wire_hole_radius(cable)` | Radius of a hole to accept a bundle of wires, rounded up to standard metric drill size |
 
 ### Modules
 | Module | Description |
@@ -4632,6 +4632,12 @@ of conductive panels, an extra layer of insulation.
 
 [tests/cable_grommets.scad](tests/cable_grommets.scad) Code for this example.
 
+### Functions
+| Function | Description |
+|:--- |:--- |
+| `mouse_grommet_length(r)` | Length of grommet given r |
+| `mouse_grommet_offset(r)` | Offset of the wire from the ground |
+
 ### Modules
 | Module | Description |
 |:--- |:--- |
@@ -4648,7 +4654,7 @@ of conductive panels, an extra layer of insulation.
 ### Printed
 | Qty | Filename |
 | ---:|:--- |
-|   1 | mouse_grommet_50_3.stl |
+|   1 | mouse_grommet_100_3.stl |
 |   1 | ribbon_grommet_20_3.stl |
 |   1 | round_grommet_bottom_60.stl |
 |   1 | round_grommet_top_60_3.stl |
diff --git a/tests/png/wire.png b/tests/png/wire.png
index bee0f3b..8851755 100644
Binary files a/tests/png/wire.png and b/tests/png/wire.png differ
diff --git a/vitamins/wire.scad b/vitamins/wire.scad
index 65294a8..99ee7f6 100644
--- a/vitamins/wire.scad
+++ b/vitamins/wire.scad
@@ -32,13 +32,13 @@ module ribbon_cable(ways, length)                   //! Add ribbon cable to the
 //
 // Cable sizes
 //
-function cable_wires(cable)     = cable[0]; //! Number of wires in a bindle
+function cable_wires(cable)     = cable[0]; //! Number of wires in a bundle
 function cable_wire_size(cable) = cable[1]; //! Size of each wire in a bundle
 
 // numbers from http://mathworld.wolfram.com/CirclePacking.html
 function cable_radius(cable) = [0, 1, 2, 2.15, 2.41, 2.7, 3, 3, 3.3][cable_wires(cable)] * cable_wire_size(cable) / 2; //! Radius of a bundle of wires, see <http://mathworld.wolfram.com/CirclePacking.html>.
 
-function wire_hole_radius(cable) = ceil(2 * cable_radius(cable) +1) / 2; //! Radius of a hole to accept a bundle of wires
+function wire_hole_radius(cable) = ceil(4 * cable_radius(cable) + 1) / 4; //! Radius of a hole to accept a bundle of wires, rounded up to standard metric drill size
 
 function cable_bundle(cable) = //! Arrangement of a bundle in a flat cable clip
     [[0,0], [1,1], [2,1], [2, 0.5 + sin(60)], [2,2], [3, 0.5 + sin(60)], [3,2]][cable_wires(cable)];
@@ -49,11 +49,11 @@ function cable_height(cable) = cable_bundle(cable)[1] * cable_wire_size(cable);
 module mouse_hole(cable, h = 100, teardrop = false) { //! A mouse hole to allow a panel to go over a wire bundle.
     r = wire_hole_radius(cable);
 
-        if(teardrop)
-            vertical_tearslot(r = r, l = 2 * r, h = h, plus = true);
-        else
-            rotate(90)
-                slot(r, 2 * r, h = h);
+    if(teardrop)
+        vertical_tearslot(r = r, l = 2 * r, h = h, plus = true);
+    else
+        rotate(90)
+            slot(r, 2 * r, h = h);
 }
 
 module cable_tie_holes(cable_r, h = 100) { //! Holes to thread a ziptie through a panel to make a cable tie.