diff --git a/src/components/transfer_menu.rs b/src/components/transfer_menu.rs
index a1f1110..5fb6f50 100644
--- a/src/components/transfer_menu.rs
+++ b/src/components/transfer_menu.rs
@@ -53,6 +53,36 @@ pub fn TransferMenu() -> Html {
         })
     };
     
+    let on_source_interleave_x_change = {
+        let ct_dispatch = ct_dispatch.clone();
+
+        Callback::from(move |e: Event| {
+            let target: Option<EventTarget> = e.target();
+            let input = target.and_then(|t| t.dyn_into::<HtmlInputElement>().ok());
+            if let Some(input) = input {
+                if let Ok(num) = input.value().parse::<i8>() {
+                    ct_dispatch.reduce_mut(|state| {
+                        state.transfer.interleave_source = (num, state.transfer.interleave_source.1);
+                    });
+                }
+            }
+        })
+    };
+    let on_source_interleave_y_change = {
+        let ct_dispatch = ct_dispatch.clone();
+
+        Callback::from(move |e: Event| {
+            let target: Option<EventTarget> = e.target();
+            let input = target.and_then(|t| t.dyn_into::<HtmlInputElement>().ok());
+            if let Some(input) = input {
+                if let Ok(num) = input.value().parse::<i8>() {
+                    ct_dispatch.reduce_mut(|state| {
+                        state.transfer.interleave_source = (state.transfer.interleave_source.0, num);
+                    });
+                }
+            }
+        })
+    };
     let on_dest_interleave_x_change = {
         let ct_dispatch = ct_dispatch.clone();
 
@@ -100,11 +130,22 @@ pub fn TransferMenu() -> Html {
                 value={RegionDisplay::from(&ct_state.transfer.dest_region).text}/>
             </div>
             <div>
+            {"Source Interleave "}
+            <label for="source_interleave_x">{"Row:"}</label>
+            <input type="number" name="source_interleave_x"
+            onchange={on_source_interleave_x_change}
+            value={ct_state.transfer.interleave_source.0.to_string()}/>
+            <label for="source_interleave_y">{"Col:"}</label>
+            <input type="number" name="source_interleave_y"
+            onchange={on_source_interleave_y_change}
+            value={ct_state.transfer.interleave_source.1.to_string()}/>
+            </div>
+            <div>
             {"Destination Interleave "}
-            <label for="dest_interleave_x">{"X:"}</label>
+            <label for="dest_interleave_x">{"Row:"}</label>
             <input type="number" name="dest_interleave_x"
             onchange={on_dest_interleave_x_change} value={ct_state.transfer.interleave_dest.0.to_string()}/>
-            <label for="dest_interleave_y">{"Y:"}</label>
+            <label for="dest_interleave_y">{"Col:"}</label>
             <input type="number" name="dest_interleave_y"
             onchange={on_dest_interleave_y_change} value={ct_state.transfer.interleave_dest.1.to_string()}/>
             </div>
diff --git a/src/data/transfer_region.rs b/src/data/transfer_region.rs
index 6ada926..fae8f9e 100644
--- a/src/data/transfer_region.rs
+++ b/src/data/transfer_region.rs
@@ -157,20 +157,23 @@ impl TransferRegion {
                             d_br.1.checked_sub(d_ul.1).unwrap() + 1,
                         );
                         let N_s = ( // Number of used source wells
-                            s_dims.0.div_euclid(il_source.0.abs() as u8),
-                            s_dims.1.div_euclid(il_source.1.abs() as u8),
+                            (s_dims.0 + il_source.0.abs() as u8 - 1).div_euclid(il_source.0.abs() as u8),
+                            (s_dims.1 + il_source.1.abs() as u8 - 1).div_euclid(il_source.1.abs() as u8),
                         );
                         let D_per_replicate = ( // How many wells are used per replicate?
-                            (s_dims.0 * (il_dest.0.abs() as u8))
+                            (N_s.0 * (il_dest.0.abs() as u8))
                             // Conditionally subtract one to ignore the trailing interleave well
                             .saturating_sub(if il_dest.0.abs() > 1 {1} else {0}),
-                            (s_dims.1 * (il_dest.1.abs() as u8))
+                            (N_s.1 * (il_dest.1.abs() as u8))
                             .saturating_sub(if il_dest.1.abs() > 1 {1} else {0}),
                         );
                         let count = ( // How many times can we replicate?
                             d_dims.0.div_euclid(D_per_replicate.0),
                             d_dims.1.div_euclid(D_per_replicate.1),
                         );
+                        let i = i.saturating_sub(s_ul.0).saturating_div(il_source.0.abs() as u8);
+                        let j = j.saturating_sub(s_ul.1).saturating_div(il_source.1.abs() as u8);
+                        log::debug!("s_dims: {:?}, N_s: {:?}", s_dims, N_s);
 
                         Some(
                             possible_destination_wells
@@ -178,13 +181,13 @@ impl TransferRegion {
                                 .filter(|(x, _)| {
                                     x.checked_sub(d_ul.0).unwrap()
                                         % (N_s.0 * il_dest.0.abs() as u8) // Counter along x
-                                    == ((il_dest.0.abs() as u8 *(i).checked_sub(1u8).unwrap()))
+                                    == ((il_dest.0.abs() as u8 *i))
                                         % (N_s.0 * il_dest.0.abs() as u8)
                                 })
                                 .filter(|(_, y)| {
                                     y.checked_sub(d_ul.1).unwrap()
                                         % (N_s.1 * il_dest.1.abs() as u8) // Counter along u
-                                    == ((il_dest.1.abs() as u8 *(j).checked_sub(1u8).unwrap()))
+                                    == ((il_dest.1.abs() as u8 *j))
                                         % (N_s.1 * il_dest.1.abs() as u8)
                                 })
                                 .filter(|(x,y)| {