diff --git a/mathmodenjoyer.jmx b/mathmodenjoyer.jmx
index c56fdec..24b3a87 100644
--- a/mathmodenjoyer.jmx
+++ b/mathmodenjoyer.jmx
@@ -4721,7 +4721,7 @@ vars.put("random_page", randomPage.toString())
                   <elementProp name="kbitem" elementType="HTTPArgument">
                     <boolProp name="HTTPArgument.always_encode">false</boolProp>
                     <stringProp name="Argument.name">kbitem</stringProp>
-                    <stringProp name="Argument.value">${__Random(1,4,)}</stringProp>
+                    <stringProp name="Argument.value">${kbitem}</stringProp>
                     <stringProp name="Argument.metadata">=</stringProp>
                     <boolProp name="HTTPArgument.use_equals">true</boolProp>
                   </elementProp>
@@ -4729,6 +4729,16 @@ vars.put(&quot;random_page&quot;, randomPage.toString())
               </elementProp>
             </HTTPSamplerProxy>
             <hashTree>
+              <JSR223PreProcessor guiclass="TestBeanGUI" testclass="JSR223PreProcessor" testname="JSR223 PreProcessor">
+                <stringProp name="scriptLanguage">groovy</stringProp>
+                <stringProp name="parameters"></stringProp>
+                <stringProp name="filename"></stringProp>
+                <stringProp name="cacheKey">true</stringProp>
+                <stringProp name="script">def values = [-1, 1, 2, 3]
+def randomValue = values[new Random().nextInt(values.size())]
+vars.put(&quot;kbitem&quot;, randomValue.toString())</stringProp>
+              </JSR223PreProcessor>
+              <hashTree/>
               <HeaderManager guiclass="HeaderPanel" testclass="HeaderManager" testname="HTTP Header Manager" enabled="true">
                 <collectionProp name="HeaderManager.headers">
                   <elementProp name="Referer" elementType="Header">