diff --git a/gradle.properties b/gradle.properties
index 9872413..0bb6e8f 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -7,4 +7,4 @@ meta_download=https://www.curseforge.com/minecraft/mc-mods/engineers-decor/
 version_minecraft=1.18.1
 version_forge_minecraft=1.18.1-39.0.5
 version_jei=1.18.1:9.1.2.54
-version_engineersdecor=1.1.19
+version_engineersdecor=1.1.20
diff --git a/meta/update.json b/meta/update.json
index f0dd3ab..6a754b4 100644
--- a/meta/update.json
+++ b/meta/update.json
@@ -1,6 +1,7 @@
 {
  "homepage": "https://www.curseforge.com/minecraft/mc-mods/engineers-decor/",
  "1.18.1": {
+  "1.1.20": "[F] Fixed Shingle Roof Wire Conduit collision shape (thx os, issue #202).\n[F] Mineral Melter accepts input items only when empty (issue #198, ty Archie).",
   "1.1.19": "[R] Release build.\n[F] Manual category RLs prefixed (issue #199, ty freopt).",
   "1.1.19-b3": "[F] Fixed rendering issue.",
   "1.1.19-b2": "[F] Fixed waterlogging.\n[F] Block entity parent saving corrected, ticker unified.\n[U] Forge/gradle update.",
@@ -50,7 +51,7 @@
   "1.1.2-b1": "[U] Ported to MC1.16.2."
  },
  "promos": {
-  "1.18.1-recommended": "1.1.19",
-  "1.18.1-latest": "1.1.19"
+  "1.18.1-recommended": "1.1.20",
+  "1.18.1-latest": "1.1.20"
  }
 }
\ No newline at end of file
diff --git a/readme.md b/readme.md
index 78eae8e..38ee575 100644
--- a/readme.md
+++ b/readme.md
@@ -11,6 +11,9 @@ Mod sources for Minecraft version 1.18.x.
 
 ## Version history
 
+    - v1.1.20    [F] Fixed Shingle Roof Wire Conduit collision shape (thx os, issue #202).
+                 [F] Mineral Melter accepts input items only when empty (issue #198, ty Archie).
+
     - v1.1.19    [R] Release build.
                  [F] Manual category RLs prefixed (issue #199, ty freopt).
 
diff --git a/src/main/java/wile/engineersdecor/blocks/EdMineralSmelter.java b/src/main/java/wile/engineersdecor/blocks/EdMineralSmelter.java
index a3527d9..7645545 100644
--- a/src/main/java/wile/engineersdecor/blocks/EdMineralSmelter.java
+++ b/src/main/java/wile/engineersdecor/blocks/EdMineralSmelter.java
@@ -149,7 +149,7 @@ public class EdMineralSmelter
       boolean dirty = false;
       if(te.accepts_lava_container(stack)) {
         if(stack.sameItemStackIgnoreDurability(MineralSmelterTileEntity.BUCKET_STACK)) { // check how this works with item capabilities or so
-          if(te.fluid_extraction_possible()) {
+          if(te.bucket_extraction_possible()) {
             if(stack.getCount() > 1) {
               int target_stack_index = -1;
               for(int i=0; i<player.getInventory().getContainerSize(); ++i) {
@@ -279,7 +279,7 @@ public class EdMineralSmelter
       item_handler_ = Inventories.MappedItemHandler.createGenericHandler(
         main_inventory_,
         (index,stack)->((index==1) && (phase()!=PHASE_LAVA)),
-        (index,stack)->((index==0) && accepts_input(stack)),
+        (index,stack)->((index==0) && (progress_==0) && accepts_input(stack)),
         (index,stack)->{},
         (index,stack)->{ if(index!=0) reset_process(); }
       );
@@ -296,7 +296,7 @@ public class EdMineralSmelter
       return PHASE_WARMUP;
     }
 
-    public boolean fluid_extraction_possible()
+    public boolean bucket_extraction_possible()
     { return tank_.getFluidAmount() >= MAX_BUCKET_EXTRACT_FLUID_LEVEL; }
 
     public int comparator_signal()
@@ -309,7 +309,7 @@ public class EdMineralSmelter
     {
       if(!main_inventory_.isEmpty()) {
         return false;
-      } else if(fluid_extraction_possible()) {
+      } else if(bucket_extraction_possible()) {
         return accepts_lava_container(stack);
       } else {
         if(stack.getItem().getTags().contains(new ResourceLocation(Auxiliaries.modid(), "accepted_mineral_smelter_input"))) return true;
@@ -424,7 +424,7 @@ public class EdMineralSmelter
         // That stays in the slot until its extracted or somone takes it out.
         if(istack.sameItem(BUCKET_STACK)) {
           if(!main_inventory_.getItem(1).sameItem(LAVA_BUCKET_STACK)) {
-            if(fluid_extraction_possible()) {
+            if(bucket_extraction_possible()) {
               reset_process();
               main_inventory_.setItem(1, LAVA_BUCKET_STACK);
               level.playSound(null, worldPosition, SoundEvents.BUCKET_FILL_LAVA, SoundSource.BLOCKS, 0.2f, 1.3f);
@@ -465,7 +465,7 @@ public class EdMineralSmelter
             } else {
               main_inventory_.setItem(0, MAGMA_STACK.copy());
               main_inventory_.setItem(1, MAGMA_STACK.copy());
-              tank_.clear();
+              tank_.drain(1000);
             }
             level.playSound(null, worldPosition, SoundEvents.LAVA_EXTINGUISH, SoundSource.BLOCKS, 0.5f, 1.1f);
             dirty = true;
@@ -491,7 +491,9 @@ public class EdMineralSmelter
         if(n > 0) {
           tank_.drain(n);
           if(tank_.isEmpty()) {
+            final ItemStack prev = main_inventory_.getItem(0);
             reset_process();
+            main_inventory_.setItem(0, prev);
             level.playSound(null, worldPosition, SoundEvents.LAVA_EXTINGUISH, SoundSource.BLOCKS, 0.3f, 0.7f);
           }
         }
diff --git a/src/main/java/wile/engineersdecor/blocks/EdRoofBlock.java b/src/main/java/wile/engineersdecor/blocks/EdRoofBlock.java
index 50596de..6c9d1ff 100644
--- a/src/main/java/wile/engineersdecor/blocks/EdRoofBlock.java
+++ b/src/main/java/wile/engineersdecor/blocks/EdRoofBlock.java
@@ -72,6 +72,10 @@ public class EdRoofBlock extends StandardBlocks.HorizontalWaterLoggable
   public VoxelShape getShape(BlockState state, BlockGetter world, BlockPos pos, CollisionContext context)
   { return shape_cache_[state.getValue(HALF).ordinal()][state.getValue(HORIZONTAL_FACING).get3DDataValue()][state.getValue(SHAPE).ordinal()]; }
 
+  @Override
+  public VoxelShape getCollisionShape(BlockState state, BlockGetter world, BlockPos pos, CollisionContext selectionContext)
+  { return getShape(state, world, pos, selectionContext); }
+
   @Override
   protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder)
   { super.createBlockStateDefinition(builder); builder.add(SHAPE, HALF); }