diff --git a/original/MECHANICS_PROGRESS.md b/original/MECHANICS_PROGRESS.md
index cef6d1a..c794701 100644
--- a/original/MECHANICS_PROGRESS.md
+++ b/original/MECHANICS_PROGRESS.md
@@ -104,7 +104,8 @@ original/tools/inject_original_state.py --x 289 --y 94 --vx 0 --vy 0
 The executable image remains unchanged; only the current disposable Wine
 process is modified. Run the injector while the ball is waiting in the launcher
 so it can identify the live game object, or supply the previously reported
-`--object-base` during a sequence of probes.
+`--object-base` to both the injector and tracer during a sequence of active
+probes.
 
 A probe at `(289,94)` captured the original terminal-18 path. The collision
 suspended the ball while frames advanced from 10 through 18 at the configured
diff --git a/original/tools/trace_original_state.py b/original/tools/trace_original_state.py
index 6fc8996..d45e8ec 100755
--- a/original/tools/trace_original_state.py
+++ b/original/tools/trace_original_state.py
@@ -261,6 +261,11 @@ def sample_state(data: bytes, obj: bytes) -> tuple[int, ...]:
 def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument("--pid", type=int, help="Linux PID of the TDKPIN winevdm.exe process")
+    parser.add_argument(
+        "--object-base",
+        type=lambda value: int(value, 0),
+        help="known live object base; otherwise locate it from the waiting ball",
+    )
     parser.add_argument("--duration", type=float, default=10.0, help="capture duration in seconds")
     parser.add_argument("--interval-ms", type=float, default=1.0, help="sampling interval in milliseconds")
     parser.add_argument("--output", type=Path, help="CSV path; stdout when omitted")
@@ -281,7 +286,11 @@ def main() -> None:
         with ProcessMemory(pid) as memory:
             data_base = locate_data_segment(memory)
             initial_data = memory.read(data_base, DATA_READ_SIZE)
-            object_base = locate_game_object(memory, initial_data)
+            object_base = (
+                args.object_base
+                if args.object_base is not None
+                else locate_game_object(memory, initial_data)
+            )
             print(
                 f"TDKPIN pid={pid} data={data_base:#x} object={object_base:#x}",
                 file=sys.stderr,