diff --git a/src/dactyl_keyboard/dactyl.clj b/src/dactyl_keyboard/dactyl.clj
index 4406063..14a6295 100644
--- a/src/dactyl_keyboard/dactyl.clj
+++ b/src/dactyl_keyboard/dactyl.clj
@@ -44,7 +44,7 @@
 
 (def thumb-offsets [6 -3 7])
 
-(def keyboard-z-offset 11)               ; controls overall height; original=9 with centercol=3; use 16 for centercol=2
+(def keyboard-z-offset 10)               ; controls overall height; original=9 with centercol=3; use 16 for centercol=2
 
 (def extra-width 2.5)                   ; extra space between the base of keys; original= 2
 (def extra-height 1.0)                  ; original= 0.5
@@ -1062,7 +1062,7 @@
   (union
    ; thumb walls
    (wall-brace newthumb-mr-place  0 -1 web-post-br newthumb-tr-place  0 -1 web-post-br)
-   (wall-brace newthumb-mr-place  0 -1 web-post-br newthumb-mr-place  0 -1 web-post-bl)
+   (wall-brace newthumb-mr-place  0 -1 web-post-br newthumb-mr-place  0 -1.15 web-post-bl)
    (wall-brace newthumb-br-place  0 -1 web-post-br newthumb-br-place  0 -1 web-post-bl)
    (wall-brace newthumb-bl-place -0.3  1 thumb-post-tr newthumb-bl-place  0  1 thumb-post-tl)
    (wall-brace newthumb-br-place -1  0 web-post-tl newthumb-br-place -1  0 web-post-bl)
@@ -1318,8 +1318,7 @@
 (defn screw-insert-shape [bottom-radius top-radius height]
   (union
    (->> (binding [*fn* 30]
-                 (cylinder [bottom-radius top-radius] height)))
-   (translate [0 0 (/ height 2)] (->> (binding [*fn* 30] (sphere top-radius))))))
+                 (cylinder [bottom-radius top-radius] height)))))
 
 (defn screw-insert [column row bottom-radius top-radius height offset]
   (let [shift-right   (= column lastcol)
@@ -1341,7 +1340,7 @@
          (screw-insert (+ 1 innercol-offset) lastrow         bottom-radius top-radius height [13 -7 0])))
 
 ; Hole Depth Y: 4.4
-(def screw-insert-height 4)
+(def screw-insert-height 6)
 
 ; Hole Diameter C: 4.1-4.4
 (def screw-insert-bottom-radius (/ 4.0 2))
@@ -1349,7 +1348,7 @@
 (def screw-insert-holes  (screw-insert-all-shapes screw-insert-bottom-radius screw-insert-top-radius screw-insert-height))
 
 ; Wall Thickness W:\t1.65
-(def screw-insert-outers (screw-insert-all-shapes (+ screw-insert-bottom-radius 1.65) (+ screw-insert-top-radius 1.65) (+ screw-insert-height 1.5)))
+(def screw-insert-outers (screw-insert-all-shapes (+ screw-insert-bottom-radius 1.65) (+ screw-insert-top-radius 1.65) (+ screw-insert-height 1)))
 (def screw-insert-screw-holes  (screw-insert-all-shapes 1.7 1.7 350))
 
 ; Connectors between outer column and right wall when 1.5u keys are used