diff --git a/k2t.py b/k2t.py
index 5884b61..fbf5214 100644
--- a/k2t.py
+++ b/k2t.py
@@ -7,6 +7,11 @@ from dataclasses import dataclass, fields
 from xml.etree import ElementTree
 
 
+# Used when value is `None`, except on groups where they're left unset
+DEFAULT_LINESTYLE = 'I0'
+DEFAULT_DITHER = 'I1'
+
+
 def k2t(
         kfile: str,
         tfile: str,
@@ -101,16 +106,16 @@ def t2k(tfile: str, kfile: str) -> None:
 
 @dataclass(slots=True)
 class Entry:
-    name: str
-    source: str | None
-    frame_color: str | None
-    fill_color: str | None
+    name: str | None = None
+    source: str | None = None
+    frame_color: str | None = None
+    fill_color: str | None = None
 
     members: list | None = None
     expanded: bool = False
 
-    dither_pattern: str = 'C1'
-    line_style: str = 'C0'
+    dither_pattern: str | None = None
+    line_style: str | None = None
     frame_brightness: int = 0
     fill_brightness: int = 0
     width: int = 1
@@ -127,11 +132,7 @@ class Entry:
         assert el.tag in ('properties', 'group-members')
 
         members = []
-        args: dict[str, Any] = {
-            'frame_color': None,
-            'fill_color': None,
-            'source': None,
-            }
+        args: dict[str, Any] = {}
         for child in el:
             if not child.text:
                 continue
@@ -157,6 +158,8 @@ class Entry:
 
         if not members:
             members = None
+            args.setdefault('line_style', DEFAULT_LINESTYLE)
+            args.setdefault('dither_pattern', DEFAULT_DITHER)
 
         return cls(members=members, **args)
 
@@ -165,22 +168,18 @@ class Entry:
         el = ElementTree.Element(main_tag)
         for field in fields(self):
             val = getattr(self, field.name)
-            if val is None or field.name == 'members':
-                continue
 
-            if (val == field.default
-                and (field not in ('dither-pattern', 'line-style')
-                    or self.source is None
-                    )):
+            if field.name == 'members':
                 continue
 
             tag = field.name.replace('_', '-')
-            if tag in ('frame-color', 'fill-color'):
-                val = '#' + val
-            if not isinstance(val, str):
-                val = str(val).lower()
             el2 = ElementTree.Element(tag)
-            el2.text = val
+            if val is not None:
+                if not isinstance(val, str):
+                    val = str(val).lower()
+                el2.text = val
+            elif tag == 'source':
+                el2.text = '*/*@*'
             el.append(el2)
 
         if self.members:
@@ -195,7 +194,9 @@ class Entry:
         s = '[[' + '.'.join(parts)  + ']]\n'
         for field in fields(self):
             val = getattr(self, field.name)
-            if val == field.default or val is None:
+            if val == field.default:
+                continue
+            if field.name == 'members':
                 continue
 
             if isinstance(val, str):
@@ -219,11 +220,7 @@ class Entry:
     @classmethod
     def from_toml(cls: Type[Self], tree: dict) -> Self:
         members = []
-        args: dict[str, Any] = {
-            'frame_color': None,
-            'fill_color': None,
-            'source': None,
-            }
+        args: dict[str, Any] = {}
         for key, val in tree.items():
             if key != 'members':
                 args[key.replace('-', '_')] = val
@@ -234,6 +231,8 @@ class Entry:
 
         if not members:
             members = None
+            args.setdefault('line_style', DEFAULT_LINESTYLE)
+            args.setdefault('dither_pattern', DEFAULT_DITHER)
 
         return cls(members=members, **args)