diff --git a/src/app/credExplorer/WeightConfig.js b/src/app/credExplorer/WeightConfig.js
index 08e19f6..87afab5 100644
--- a/src/app/credExplorer/WeightConfig.js
+++ b/src/app/credExplorer/WeightConfig.js
@@ -6,9 +6,14 @@ import sortBy from "lodash.sortby";
 import {type EdgeEvaluator} from "../../core/attribution/pagerank";
 import {byEdgeType, byNodeType} from "./edgeWeights";
 import {defaultStaticAdapters} from "../adapters/defaultPlugins";
-import type {NodeType, EdgeType} from "../adapters/pluginAdapter";
+import type {EdgeType} from "../adapters/pluginAdapter";
 import {WeightSlider} from "./weights/WeightSlider";
 import {DirectionalitySlider} from "./weights/DirectionalitySlider";
+import {
+  NodeTypeConfig,
+  defaultWeightedNodeType,
+  type WeightedNodeType,
+} from "./weights/NodeTypeConfig";
 
 type Props = {|
   +onChange: (EdgeEvaluator) => void,
@@ -28,19 +33,9 @@ const defaultEdgeWeights = (): EdgeWeights => {
   return result;
 };
 
-type NodeWeights = WeightedNodeType[];
-type WeightedNodeType = {|+type: NodeType, +weight: number|};
-const defaultNodeWeights = (): NodeWeights => {
-  const result = [];
-  for (const type of defaultStaticAdapters().nodeTypes()) {
-    result.push({type, weight: type.defaultWeight});
-  }
-  return result;
-};
-
 type State = {
   edgeWeights: EdgeWeights,
-  nodeWeights: NodeWeights,
+  nodeWeights: $ReadOnlyArray<WeightedNodeType>,
   expanded: boolean,
 };
 
@@ -49,7 +44,9 @@ export class WeightConfig extends React.Component<Props, State> {
     super(props);
     this.state = {
       edgeWeights: defaultEdgeWeights(),
-      nodeWeights: defaultNodeWeights(),
+      nodeWeights: defaultStaticAdapters()
+        .nodeTypes()
+        .map(defaultWeightedNodeType),
       expanded: false,
     };
   }
@@ -175,36 +172,30 @@ class EdgeConfig extends React.Component<{
 }
 
 class NodeConfig extends React.Component<{
-  nodeWeights: NodeWeights,
-  onChange: (NodeWeights) => void,
+  nodeWeights: $ReadOnlyArray<WeightedNodeType>,
+  onChange: ($ReadOnlyArray<WeightedNodeType>) => void,
 }> {
-  render() {
-    const sortedWeights = sortBy(
-      this.props.nodeWeights,
-      ({type}) => type.prefix
-    );
-
-    const controls = sortedWeights.map(({type, weight}) => {
-      const onChange = (value) => {
-        const nodeWeights = this.props.nodeWeights.filter(
-          (x) => x.type.prefix !== type.prefix
+  _renderControls() {
+    return sortBy(this.props.nodeWeights, ({type}) => type.prefix).map(
+      (weightedType) => {
+        const onChange = (newType) => {
+          const nodeWeights = this.props.nodeWeights.filter(
+            (x) => x.type.prefix !== weightedType.type.prefix
+          );
+          nodeWeights.push(newType);
+          this.props.onChange(nodeWeights);
+        };
+        return (
+          <NodeTypeConfig weightedType={weightedType} onChange={onChange} />
         );
-        nodeWeights.push({type, weight: value});
-        this.props.onChange(nodeWeights);
-      };
-      return (
-        <WeightSlider
-          key={type.prefix}
-          weight={weight}
-          name={type.name}
-          onChange={onChange}
-        />
-      );
-    });
+      }
+    );
+  }
+  render() {
     return (
       <div>
         <h2>Node weights</h2>
-        {controls}
+        {this._renderControls()}
       </div>
     );
   }
diff --git a/src/app/credExplorer/weights/NodeTypeConfig.js b/src/app/credExplorer/weights/NodeTypeConfig.js
new file mode 100644
index 0000000..f22dcff
--- /dev/null
+++ b/src/app/credExplorer/weights/NodeTypeConfig.js
@@ -0,0 +1,34 @@
+// @flow
+
+import React from "react";
+import {WeightSlider} from "./WeightSlider";
+import {type NodeType} from "../../adapters/pluginAdapter";
+
+export type WeightedNodeType = {|+type: NodeType, +weight: number|};
+
+export function defaultWeightedNodeType(type: NodeType): WeightedNodeType {
+  return {
+    type,
+    weight: type.defaultWeight,
+  };
+}
+
+export class NodeTypeConfig extends React.Component<{
+  +weightedType: WeightedNodeType,
+  +onChange: (WeightedNodeType) => void,
+}> {
+  render() {
+    return (
+      <WeightSlider
+        name={this.props.weightedType.type.name}
+        weight={this.props.weightedType.weight}
+        onChange={(weight) => {
+          this.props.onChange({
+            ...this.props.weightedType,
+            weight,
+          });
+        }}
+      />
+    );
+  }
+}
diff --git a/src/app/credExplorer/weights/NodeTypeConfig.test.js b/src/app/credExplorer/weights/NodeTypeConfig.test.js
new file mode 100644
index 0000000..c1c33e5
--- /dev/null
+++ b/src/app/credExplorer/weights/NodeTypeConfig.test.js
@@ -0,0 +1,45 @@
+// @flow
+
+import React from "react";
+import {shallow} from "enzyme";
+
+import {WeightSlider} from "./WeightSlider";
+import {defaultWeightedNodeType, NodeTypeConfig} from "./NodeTypeConfig";
+import {inserterNodeType} from "../../adapters/demoAdapters";
+
+require("../../testUtil").configureEnzyme();
+
+describe("app/credExplorer/weights/NodeTypeConfig", () => {
+  describe("defaultWeightedNodeType", () => {
+    it("sets default weight as specified in type", () => {
+      const wnt = defaultWeightedNodeType(inserterNodeType);
+      expect(wnt.weight).toEqual(wnt.type.defaultWeight);
+    });
+  });
+  describe("NodeTypeConfig", () => {
+    function example() {
+      const onChange = jest.fn();
+      const wnt = {
+        type: inserterNodeType,
+        weight: 0.125,
+      };
+      const element = shallow(
+        <NodeTypeConfig onChange={onChange} weightedType={wnt} />
+      );
+      const slider = element.find(WeightSlider);
+      return {onChange, wnt, slider};
+    }
+    it("sets up the weight slider", () => {
+      const {wnt, slider} = example();
+      expect(slider.props().name).toBe(wnt.type.name);
+      expect(slider.props().weight).toBe(wnt.weight);
+    });
+    it("weight slider onChange works", () => {
+      const {wnt, slider, onChange} = example();
+      slider.props().onChange(9);
+      const updated = {...wnt, weight: 9};
+      expect(onChange).toHaveBeenCalledTimes(1);
+      expect(onChange.mock.calls[0][0]).toEqual(updated);
+    });
+  });
+});