X-Git-Url: http://challenge-bot.com/repos/?p=challenge-bot;a=blobdiff_plain;f=guide%2Fchallenge-bot.scm;h=9ea816f7dc8eb1a972b7dabf0a1b87a027a568f5;hp=da614d50dfe9b505dba0c5faaee74a4fed9cebf6;hb=23599b44d76e37dd59cf0a7891a62d19788aa266;hpb=32d7d032baae1b2d075a82c2395abfd04c76a771

diff --git a/guide/challenge-bot.scm b/guide/challenge-bot.scm
index da614d5..9ea816f 100644
--- a/guide/challenge-bot.scm
+++ b/guide/challenge-bot.scm
@@ -565,16 +565,23 @@
              as you can while tightening it down.
              this will give more clearance to the wheels of the robot
              so they do not rub the deck.])))
+  (section
+   :title [caster]
+   (p [the caster will go at the back of the robot and provide a third
+           point of contact for the robot, making it easier for it to
+           balance.])
+   (figure
+    :legend "caster"
+    (video :file "4-caster-to-deck.ogv"))
+   (p [check])
+   (enumerate
+    (item [what would happen if the robot did not have a caster?])))
   (section
    :title [wheels]
    (subsection
     :title [tread])
    (subsection
     :title [motor]))
-  (section
-   :title [caster]
-   (subsection
-    :title [deck placement]))
   (section
    :title [sonars]
    (subsection