diff --git a/klippy/extras/z_tilt.py b/klippy/extras/z_tilt.py
index e4f4b18a..ef69c0e6 100644
--- a/klippy/extras/z_tilt.py
+++ b/klippy/extras/z_tilt.py
@@ -74,22 +74,23 @@ class RetryHelper:
             config.getfloat("retry_tolerance", 0., above=0.)
         self.value_label = "Probed points range"
         self.error_msg_extra = error_msg_extra
-    def start(self, params):
-        self.max_retries = self.gcode.get_int('RETRIES', params,
-            default=self.default_max_retries, minval=0, maxval=30)
-        self.retry_tolerance = self.gcode.get_float('RETRY_TOLERANCE', params,
-            default=self.default_retry_tolerance, minval=0, maxval=1.0)
+    def start(self, gcmd):
+        self.max_retries = gcmd.get_int('RETRIES', self.default_max_retries,
+                                        minval=0, maxval=30)
+        self.retry_tolerance = gcmd.get_float('RETRY_TOLERANCE',
+                                              self.default_retry_tolerance,
+                                              minval=0.0, maxval=1.0)
         self.current_retry = 0
         self.previous = None
         self.increasing = 0
-    def check_increase(self,error):
+    def check_increase(self, error):
         if self.previous and error > self.previous + 0.0000001:
             self.increasing += 1
         elif self.increasing > 0:
             self.increasing -= 1
         self.previous = error
         return self.increasing > 1
-    def check_retry(self,z_positions):
+    def check_retry(self, z_positions):
         if self.max_retries == 0:
             return
         error = max(z_positions) - min(z_positions)
@@ -124,13 +125,13 @@ class ZTilt:
         self.probe_helper.minimum_points(2)
         self.z_helper = ZAdjustHelper(config, len(self.z_positions))
         # Register Z_TILT_ADJUST command
-        self.gcode = self.printer.lookup_object('gcode')
-        self.gcode.register_command('Z_TILT_ADJUST', self.cmd_Z_TILT_ADJUST,
-                                    desc=self.cmd_Z_TILT_ADJUST_help)
+        gcode = self.printer.lookup_object('gcode')
+        gcode.register_command('Z_TILT_ADJUST', self.cmd_Z_TILT_ADJUST,
+                               desc=self.cmd_Z_TILT_ADJUST_help)
     cmd_Z_TILT_ADJUST_help = "Adjust the Z tilt"
-    def cmd_Z_TILT_ADJUST(self, params):
-        self.retry_helper.start(params)
-        self.probe_helper.start_probe(params)
+    def cmd_Z_TILT_ADJUST(self, gcmd):
+        self.retry_helper.start(gcmd)
+        self.probe_helper.start_probe(gcmd)
     def probe_finalize(self, offsets, positions):
         # Setup for coordinate descent analysis
         z_offset = offsets[2]