diff --git a/google_sheet_handler.py b/google_sheet_handler.py
index 881549d2..a08c2b2f 100644
--- a/google_sheet_handler.py
+++ b/google_sheet_handler.py
@@ -24,22 +24,6 @@ class GoogleSheetHandler:
         self._all_data_with_headers = []
         self._header_rows = 5
 
-    def _get_col_letter(self, col_idx_1_based):
-        """
-        Konvertiert einen 1-basierten Spaltenindex in den entsprechenden
-        Google Sheets Spaltenbuchstaben (A, B, ..., Z, AA, ...).
-        """
-        if not isinstance(col_idx_1_based, int) or col_idx_1_based < 1:
-            self.logger.error(f"Ungültiger Spaltenindex ({col_idx_1_based}) für _get_col_letter erhalten.")
-            return None
-
-        string = ""
-        n = col_idx_1_based
-        while n > 0:
-            n, remainder = divmod(n - 1, 26)
-            string = chr(65 + remainder) + string
-        return string
-
     @retry_on_failure
     def _connect(self):
         if self.client: return True