diff --git a/instrument/OFFSPEC_Definition.xml b/instrument/OFFSPEC_Definition.xml
index e3b4cd849985d93d466b16c18a9e13cc74e03483..93c11222f1afc1c68bc060a39a54443cf6fb6acb 100644
--- a/instrument/OFFSPEC_Definition.xml
+++ b/instrument/OFFSPEC_Definition.xml
@@ -5,7 +5,7 @@
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://www.mantidproject.org/IDF/1.0 http://schema.mantidproject.org/IDF/1.0/IDFSchema.xsd"
  name="OFFSPEC" valid-from   ="2012-01-02 00:00:00"
-                           valid-to     ="2112-01-02 23:59:59"
+                           valid-to     ="2115-01-02 23:59:59"
 		           last-modified="2015-10-10 15:00:00">
 
   <defaults>
@@ -109,7 +109,7 @@
      <location  z=" 3.52 " />
    </component>
    <component type="WLSFDetector">
-     <location  z=" 3.63 " />
+     <location  z=" 3.62 " />
    </component>
   </type>
 
@@ -688,19 +688,20 @@
    <locations y="-0.19975" y-end="0.18425" n-elements="768" />
    <locations y="-0.200" y-end="0.184" n-elements="768" />
    <locations y="-0.19775" y-end="0.18225" n-elements="768" />
+   <locations y="-0.202325" y-end="0.186145" n-elements="768" />
 -->
   <type name="WLSFDetector">
  <component type="wlsfpixel">
-   <locations y="-0.202325" y-end="0.186145" n-elements="768" />
+   <locations y="-0.2074" y-end="0.190808" n-elements="768" />
  </component>
  </type>
  
   <type name="wlsfpixel" is="detector">
     <cuboid id="shape">
-      <left-front-bottom-point x="-0.025" y="-0.000255" z="0.0"  />
-      <left-front-top-point  x="-0.025" y="0.000255" z="0.0"  />
-      <left-back-bottom-point  x="-0.025" y="-0.00025" z="0.05"  />
-      <right-front-bottom-point  x="0.025" y="-0.00025" z="0.0"  />
+      <left-front-bottom-point x="-0.025" y="-0.00025925" z="0.0"  />
+      <left-front-top-point  x="-0.025" y="0.00025925" z="0.0"  />
+      <left-back-bottom-point  x="-0.025" y="-0.00025925" z="0.05"  />
+      <right-front-bottom-point  x="0.025" y="-0.00025925" z="0.0"  />
     </cuboid>
     <algebra val="shape" />
   </type>