diff --git a/compact/definitions.xml b/compact/definitions.xml
index 829c323624190c5074824133f0cfc6f5dff15ec4..ac42e8b473c5d62aa26b9184e4a1fa63e86dbdd2 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -321,7 +321,7 @@
     <comment>Helmholtz option</comment>
     <comment>
     <constant name="Solenoid_length"           value="3840.0*mm"/>
-    <constant name="Solenoid_rmin"             value="1665.0*mm"/> <!-- Larger inner bore radius -->
+    <constant name="Solenoid_rmin"             value="1655.0*mm"/> <!-- Larger inner bore radius -->
     <constant name="Solenoid_thickness"        value="640*mm"/>
     <constant name="Solenoid_offset"           value="10*mm"/>
     </comment>
diff --git a/compact/helmholtz.xml b/compact/helmholtz.xml
index 11916638597d9c8110c5906fd2199b6efb1f3329..d09f469eb45e9e2ff16e358cd4247097d5d604de 100644
--- a/compact/helmholtz.xml
+++ b/compact/helmholtz.xml
@@ -12,7 +12,7 @@
     <constant name="SolenoidBarrelInnerThermalShieldThickness"  value=" 10.0 * mm"/>
     <constant name="SolenoidBarrelInnerFirstMLILayerThickness"  value=" 15.0 * mm"/>
     <constant name="SolenoidBarrelInnerHeliumVesselThickness"   value=" 20.0 * mm"/>
-    <constant name="SolenoidBarrelInnerHeliumThickness"         value="  0.0 * mm"/> <!-- modification -->
+    <constant name="SolenoidBarrelInnerHeliumThickness"         value=" 10.0 * mm"/>
     <constant name="SolenoidBarrelCoilFormerThickness"          value=" 50.0 * mm"/>
     <constant name="SolenoidBarrelCoilThickness"                value="210.0 * mm"/> <!-- modification -->
     <constant name="SolenoidBarrelBlockThickness"               value="210.0 * mm"/> <!-- addition -->