diff --git a/site_ansto/instrument/bilby/config/chopper/chopper.tcl b/site_ansto/instrument/bilby/config/chopper/chopper.tcl
index 462756e2..ec259b3a 100644
--- a/site_ansto/instrument/bilby/config/chopper/chopper.tcl
+++ b/site_ansto/instrument/bilby/config/chopper/chopper.tcl
@@ -50,3 +50,7 @@ if [dict exists $::config_dict disk_chopper name] {
 sicslist setatt t0_chopper_freq klass NXdisk_chopper
 sicslist setatt t0_chopper_freq long_name t0_chopper_freq
 sicslist setatt t0_chopper_freq mutable true
+::utility::mkVar master_chopper_id int user master_chopper_id true NXdisk_chopper true true
+::utility::mkVar master_chopper_freq float user master_chopper_freq true NXdisk_chopper true true
+::utility::mkVar t0_chopper_phase float user t0_chopper_phase true NXdisk_chopper true true
+
diff --git a/site_ansto/instrument/bilby/config/motors/motor_configuration.tcl b/site_ansto/instrument/bilby/config/motors/motor_configuration.tcl
index d8396c28..8bc951d6 100644
--- a/site_ansto/instrument/bilby/config/motors/motor_configuration.tcl
+++ b/site_ansto/instrument/bilby/config/motors/motor_configuration.tcl
@@ -516,7 +516,7 @@ sicslist setatt gs_L2_curtaind long_name L2_curtaind
 
 ## Lt0
 proc Lt0 {} {
-    set t0_id [SplitReply [t0_chopper_id]]
+    set t0_id [SplitReply [master_chopper_id]]
     switch $t0_id {
       "1" { set retval 0.0}
       "2" { set retval 1100.0}