Added tweak up and tweak down buttons.

Next up, add a bunch of extra nodes.

Change-Id: I4c2df145298567e61e8c36760be88f59a391588b
diff --git a/y2018/constants.cc b/y2018/constants.cc
index cef8979..8180bdc 100644
--- a/y2018/constants.cc
+++ b/y2018/constants.cc
@@ -122,9 +122,9 @@
       arm_proximal->potentiometer_offset = -1.242 - 0.03 - 0.1;
 
       arm_distal->zeroing.measured_absolute_position =
-          1.102987 - kDistalZeroingPosition + 0.12;
+          1.102987 - kDistalZeroingPosition + 0.12 + 0.0095;
       arm_distal->potentiometer_offset =
-          2.772210 + M_PI + 0.434 - 0.12 + 1.25 - 0.226;
+          2.772210 + M_PI + 0.434 - 0.12 + 1.25 - 0.226 + 0.862067;
       break;
 
     default: