diff --git a/site_ansto/instrument/reflectometer/config/motors/motor_configuration.tcl b/site_ansto/instrument/reflectometer/config/motors/motor_configuration.tcl
index dcc06ad8..b9f1eb3d 100644
--- a/site_ansto/instrument/reflectometer/config/motors/motor_configuration.tcl
+++ b/site_ansto/instrument/reflectometer/config/motors/motor_configuration.tcl
@@ -1,7 +1,7 @@
-# $Revision: 1.11 $
-# $Date: 2007-04-16 06:16:57 $
+# $Revision: 1.12 $
+# $Date: 2007-04-19 00:08:59 $
 # Author: Ferdi Franceschini (ffr@ansto.gov.au)
-# Last revision by: $Author: ffr $
+# Last revision by: $Author: dcl $
 
 # START MOTOR CONFIGURATION
 
@@ -46,8 +46,11 @@ set szStepRate -125000
 set szCountRate [expr -(8192.0/5.0/0.932)]
 
 #Measured or computed slit motor steps per millimetre
-# 125 steps * 161:1 gears = 20125
-set slitStepRate  20125
+# 2mm per turn pitch,
+# 6 * 7:3 gears ~= 161.384
+# 250 steps per turn,
+# = 20173.010973936899862825788751715
+set slitStepRate 20173.0109739
 
 #Measured slit gap, in units, after homing on limit switches
 set ss1h_Gap       56.7