diff --git a/numass-main/src/main/groovy/inr/numass/scripts/ShowTransmission.groovy b/numass-main/src/main/groovy/inr/numass/scripts/ShowTransmission.groovy
index 562e9f41..c551ad8a 100644
--- a/numass-main/src/main/groovy/inr/numass/scripts/ShowTransmission.groovy
+++ b/numass-main/src/main/groovy/inr/numass/scripts/ShowTransmission.groovy
@@ -10,7 +10,6 @@ import inr.numass.models.sterile.NumassResolution
 import inr.numass.models.sterile.SterileNeutrinoSpectrum
 
 import static hep.dataforge.grind.Grind.buildMeta
-import static hep.dataforge.grind.Grind.morph
 
 Context ctx = Global.instance()
 ctx.getPluginManager().load(FXPlotManager)
@@ -22,7 +21,7 @@ shell.eval {
     PlotHelper plot = plots
 
 
-    ParamSet params = morph(ParamSet,[:], "params") {
+    ParamSet params = new ParamSet(buildMeta {
         N(value: 2.7e+06, err: 30, lower: 0)
         bkg(value: 5.0, err: 0.1)
         E0(value: 18575.0, err: 0.1)
@@ -31,7 +30,7 @@ shell.eval {
         U2(value: 0.0, err: 1e-3)
         X(value: 0.0, err: 0.01, lower: 0)
         trap(value: 1.0, err: 0.05)
-    }
+    })
 
     def meta1 = buildMeta {
         resolution(width: 8.3e-5, tail: "(0.99797 - 3.05346E-7*D - 5.45738E-10 * D**2 - 6.36105E-14 * D**3)")
diff --git a/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt b/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
index f91135db..0f016777 100644
--- a/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
+++ b/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
@@ -16,9 +16,7 @@
 package inr.numass
 
 import hep.dataforge.actions.ActionManager
-import hep.dataforge.context.BasicPlugin
-import hep.dataforge.context.Context
-import hep.dataforge.context.PluginDef
+import hep.dataforge.context.*
 import hep.dataforge.fx.FXPlugin
 import hep.dataforge.fx.plots.PlotContainer
 import hep.dataforge.maths.MathPlugin
@@ -267,6 +265,17 @@ class NumassPlugin : BasicPlugin() {
             Adapters.buildXYAdapter(NumassPoint.HV_KEY, NumassAnalyzer.COUNT_RATE_KEY, NumassAnalyzer.COUNT_RATE_ERROR_KEY)
         }
     }
+
+    class Factory : PluginFactory {
+
+        override fun getTag(): PluginTag {
+            return Plugin.resolveTag(NumassPlugin::class.java)
+        }
+
+        override fun build(meta: Meta): Plugin {
+            return NumassPlugin()
+        }
+    }
 }
 
 /**
diff --git a/numass-main/src/main/resources/META-INF/services/hep.dataforge.context.Plugin b/numass-main/src/main/resources/META-INF/services/hep.dataforge.context.Plugin
deleted file mode 100644
index 668b5e99..00000000
--- a/numass-main/src/main/resources/META-INF/services/hep.dataforge.context.Plugin
+++ /dev/null
@@ -1 +0,0 @@
-inr.numass.NumassPlugin
\ No newline at end of file
diff --git a/numass-main/src/main/resources/META-INF/services/hep.dataforge.context.PluginFactory b/numass-main/src/main/resources/META-INF/services/hep.dataforge.context.PluginFactory
new file mode 100644
index 00000000..a045d442
--- /dev/null
+++ b/numass-main/src/main/resources/META-INF/services/hep.dataforge.context.PluginFactory
@@ -0,0 +1 @@
+inr.numass.NumassPlugin$Factory
\ No newline at end of file