diff -r bfd185ad03e7 -r 42b710b0f883 rust/hwphysics/src/collision.rs
--- a/rust/hwphysics/src/collision.rs	Thu Jul 25 21:59:20 2019 +0300
+++ b/rust/hwphysics/src/collision.rs	Thu Jul 25 22:31:24 2019 +0300
@@ -147,4 +147,8 @@
     fn add(&mut self, gear_id: GearId, gear_data: CollisionData) {
         self.grid.insert_static(gear_id, &gear_data.bounds);
     }
+
+    fn remove(&mut self, gear_id: GearId) {
+        self.grid.remove(gear_id);
+    }
 }