diff --git a/internal/config/make_rule_targets.go b/internal/config/make_rule_targets.go
index b5165f8..f752fef 100644
--- a/internal/config/make_rule_targets.go
+++ b/internal/config/make_rule_targets.go
@@ -65,6 +65,10 @@ func makeRuleTargetAxis(targetConfig RuleTargetConfig, devs map[string]*evdev.In
 		return nil, fmt.Errorf("non-existent device '%s'", targetConfig.Device)
 	}
 
+	if targetConfig.DeadzoneEnd < targetConfig.DeadzoneStart {
+		return nil, errors.New("deadzone_end must be greater than deadzone_start")
+	}
+
 	var eventCode evdev.EvCode
 	axisConfig := strings.ToUpper(targetConfig.Axis)
 	switch {
@@ -121,7 +125,7 @@ func makeRuleTargetRelaxis(targetConfig RuleTargetConfig, devs map[string]*evdev
 		eventCode = evdev.EvCode(codeInt)
 
 	default:
-		eventCode, ok = evdev.ABSFromString["REL_"+axisConfig]
+		eventCode, ok = evdev.RELFromString["REL_"+axisConfig]
 		if !ok {
 			return nil, fmt.Errorf("invalid axis code '%s'", axisConfig)
 		}
diff --git a/internal/config/make_rule_targets_test.go b/internal/config/make_rule_targets_test.go
index a149b8a..770a4fe 100644
--- a/internal/config/make_rule_targets_test.go
+++ b/internal/config/make_rule_targets_test.go
@@ -19,7 +19,127 @@ func (t *MakeRuleTargetsTests) SetupSuite() {
 }
 
 func (t *MakeRuleTargetsTests) TestMakeRuleTargetButton() {
-	// STUB
+	config := RuleTargetConfig{
+		Device: "test",
+	}
+	t.Run("Standard keycode", func() {
+		config.Button = "BTN_TRIGGER"
+		rule, err := makeRuleTargetButton(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.BTN_TRIGGER, rule.Button)
+	})
+
+	t.Run("Hex code", func() {
+		config.Button = "0x2fd"
+		rule, err := makeRuleTargetButton(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.EvCode(0x2fd), rule.Button)
+	})
+
+	t.Run("Index", func() {
+		config.Button = "3"
+		rule, err := makeRuleTargetButton(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.BTN_TOP, rule.Button)
+	})
+
+	t.Run("Index too high", func() {
+		config.Button = "74"
+		_, err := makeRuleTargetButton(config, t.devs)
+		t.NotNil(err)
+	})
+
+	t.Run("Un-prefixed keycode", func() {
+		config.Button = "pinkie"
+		rule, err := makeRuleTargetButton(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.BTN_PINKIE, rule.Button)
+	})
+
+	t.Run("Invalid keycode", func() {
+		config.Button = "foo"
+		_, err := makeRuleTargetButton(config, t.devs)
+		t.NotNil(err)
+	})
+}
+
+func (t *MakeRuleTargetsTests) TestMakeRuleTargetAxis() {
+	config := RuleTargetConfig{
+		Device: "test",
+	}
+
+	t.Run("Standard keycode", func() {
+		config.Axis = "ABS_X"
+		rule, err := makeRuleTargetAxis(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.ABS_X, rule.Axis)
+	})
+
+	t.Run("Hex keycode", func() {
+		config.Axis = "0x01"
+		rule, err := makeRuleTargetAxis(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.ABS_Y, rule.Axis)
+	})
+
+	t.Run("Un-prefixed keycode", func() {
+		config.Axis = "x"
+		rule, err := makeRuleTargetAxis(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.ABS_X, rule.Axis)
+	})
+
+	t.Run("Invalid keycode", func() {
+		config.Axis = "foo"
+		_, err := makeRuleTargetAxis(config, t.devs)
+		t.NotNil(err)
+	})
+
+	t.Run("Invalid deadzone", func() {
+		config.DeadzoneEnd = 100
+		config.DeadzoneStart = 1000
+		_, err := makeRuleTargetAxis(config, t.devs)
+		t.NotNil(err)
+	})
+}
+
+func (t *MakeRuleTargetsTests) TestMakeRuleTargetRelaxis() {
+	config := RuleTargetConfig{
+		Device: "test",
+	}
+
+	t.Run("Standard keycode", func() {
+		config.Axis = "REL_WHEEL"
+		rule, err := makeRuleTargetRelaxis(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.REL_WHEEL, rule.Axis)
+	})
+
+	t.Run("Hex keycode", func() {
+		config.Axis = "0x00"
+		rule, err := makeRuleTargetRelaxis(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.REL_X, rule.Axis)
+	})
+
+	t.Run("Un-prefixed keycode", func() {
+		config.Axis = "wheel"
+		rule, err := makeRuleTargetRelaxis(config, t.devs)
+		t.Nil(err)
+		t.EqualValues(evdev.REL_WHEEL, rule.Axis)
+	})
+
+	t.Run("Invalid keycode", func() {
+		config.Axis = "foo"
+		_, err := makeRuleTargetRelaxis(config, t.devs)
+		t.NotNil(err)
+	})
+
+	t.Run("Incorrect axis type", func() {
+		config.Axis = "ABS_X"
+		_, err := makeRuleTargetRelaxis(config, t.devs)
+		t.NotNil(err)
+	})
 }
 
 func TestRunnerMakeRuleTargets(t *testing.T) {