diff --git a/site_ansto/instrument/bilby/config/motors/motor_configuration.tcl b/site_ansto/instrument/bilby/config/motors/motor_configuration.tcl
index 2bf315e2..66ca77ab 100644
--- a/site_ansto/instrument/bilby/config/motors/motor_configuration.tcl
+++ b/site_ansto/instrument/bilby/config/motors/motor_configuration.tcl
@@ -11,7 +11,9 @@ add_tank tank aqadapter mc8
 
 for {set n 1} {$n <= 8} {incr n} {
   make_coll_motor_1 c$n c$n pc$n count
+  pc$n position_names guide apertures
   make_coll_motor_1 a$n a$n ap$n  count
+  ap$n position_names D10 D20 D40 S40 R100
 }
 
 # Make a position-motor for the attenuator
@@ -28,6 +30,7 @@ foreach pos {27 55 84 114 146 179 213 248 288 333} {
   lappend poslist [expr 333 - $pos]
 }
 sapmot positions {*}$poslist
+sapmot position_names D2.5 D5 D7.5 D10 D12.5 D15 D17.5 D20 D30 D40
 # sap is a 10 position virtual motor for sapmot. D2.5 is at position 1
 make_vmot sap sapmot count
 sapmot precision 0.001
@@ -48,17 +51,21 @@ sapmot precision 0.001
 # drive the other guides to the aperture position with all the aperture arms
 # raised.
 # \param num (optional) Number of guides to be selected.
+# \param sel_ap_name The position name for the first aperture selected after last guide.
+# \param aprest_name The position name for the rest of the apertures
 # \return The number of selected guides or an error message
-::utility::macro::getset float nguide { {num "REPORTNUM"} } {
+::utility::macro::getset float nguide { {num "REPORTNUM"} {sel_ap_name "NONE"} {aprest_name "NONE"}} {
   set catch_status [ catch {
     set FINDFIRST 1
     set COUNT 2
     set CheckDrive 0
+    set ap_names { D10 D20 D40 S40 R100 }
     array set EMSG {
-      invalidarg "Invalid argument"
+      invalidarg "Invalid arguments"
       gaps "There are gaps in the sequence of selected guides"
       drivefailed "Drive failed."
       misaligned "Misalignment. At least one guide is not in the aperture or guide position"
+      apfailed "Failed to set apertures"
     }
     set guideposit 1
     set apposit 2
@@ -68,6 +75,13 @@ sapmot precision 0.001
     set apdrvlist {ap1 1 ap2 1 ap3 1 ap4 1 ap5 1 ap6 1 ap7 1 ap8 1}
     set pcdrvlist {}
     if {$num != "REPORTNUM"} {
+      if { $sel_ap_name == "NONE" || $aprest_name == "NONE" } {
+        error "EMSG(invalidarg): You must provide two aperture arguments"
+      } elseif [lsearch -nocase $sel_ap_name] {
+        error "EMSG(invalidarg): $sel_ap_name should be one of $ap_names"
+      } elseif [lsearch -nocase $aprest_name] {
+        error "EMSG(invalidarg): $aprest_name should be one of $ap_names"
+      }
       if {$num >= 0 && $num <= 8} {
         set CheckDrive true
         set last 8
@@ -124,6 +138,25 @@ sapmot precision 0.001
     if {$CheckDrive} {
       if {$ng != $num} {
         error "$EMSG(drivefailed)"
+      } else {
+        for {set n [expr $last - 1]} {$n > 0} {incr n -1} {
+          lappend aprest_list ap$n $aprest_name
+        }
+        pdrive ap$last $sel_ap_name {*}$aprest_list
+        set sel_ap_pos [SplitReply [ ap$last ]]
+        set req_sel_ap_pos [ SplitReply [ ap$last posit2unit $sel_ap_name ] ]
+        set prec [ SplitReply [ap$last precision] ]
+        if { [expr abs($req_sel_ap_pos - $sel_ap_pos)] > $prec } {
+          error "$EMSG(apfailed): ap$last"
+        }
+        foreach ap_mot ap_name $aprest_list {
+          set sel_pos [SplitReply [ $ap_mot ]]
+          set req_pos [ SplitReply [ $ap_mot posit2unit $ap_name ] ]
+          set prec [ SplitReply [$ap_mot precision] ]
+          if { [expr abs($req_pos - $sel_pos)] > $prec } {
+            error "$EMSG(apfailed): $ap_mot"
+          }
+        }
       }
     }
     return "[lindex [info level 0] 0] = $ng"