diff --git a/arpes/utilities/conversion/core.py b/arpes/utilities/conversion/core.py
index 2378c963..dc20e3b2 100644
--- a/arpes/utilities/conversion/core.py
+++ b/arpes/utilities/conversion/core.py
@@ -36,7 +36,6 @@
 
 from arpes.provenance import PROVENANCE, provenance, update_provenance
 from arpes.utilities import normalize_to_spectrum
-from arpes.utilities.conversion.calibration import DetectorCalibration
 
 from .fast_interp import Interpolator
 from .grids import (
@@ -51,6 +50,7 @@
     from numpy.typing import NDArray
 
     from arpes._typing import MOMENTUM
+    from arpes.utilities.conversion.calibration import DetectorCalibration
 
 __all__ = ["convert_to_kspace", "slice_along_path"]
 
@@ -477,15 +477,10 @@ def convert_to_kspace(
     return result.assign_coords(restore_index_like_coordinates)
 
 
-class TRANSFORMCOORDS(TypedDict, total=False):
-    dims: list[str]
-    transforms: NDArray[np.float_]
-
-
 def convert_coordinates(
     arr: xr.DataArray,
     target_coordinates: dict[Hashable, NDArray[np.float_]],
-    coordinate_transform: dict[Hashable, NDArray[np.float_]],
+    coordinate_transform: dict[Hashable, list[str] | dict[Hashable, NDArray[np.float_]]],
     *,
     as_dataset: bool = False,
 ) -> xr.DataArray | xr.Dataset:
@@ -521,8 +516,10 @@ def convert_coordinates(
         with contextlib.suppress(ValueError):
             meshed_coordinates = [arr.S.lookup_offset_coord("eV"), *meshed_coordinates]
     old_coord_names = [dim for dim in arr.dims if dim not in target_coordinates]
+    assert isinstance(coordinate_transform["transforms"], dict)
+    transforms: dict[Hashable, NDArray[np.float_]] = coordinate_transform["transforms"]
     old_coordinate_transforms = [
-        coordinate_transform["transforms"][dim] for dim in arr.dims if dim not in target_coordinates
+        transforms[dim] for dim in arr.dims if dim not in target_coordinates
     ]
 
     output_shape = [len(target_coordinates[d]) for d in coordinate_transform["dims"]]