diff --git a/repository/TiddlyWiki/Tiddler.class.st b/repository/TiddlyWiki/Tiddler.class.st
index 2d29439..6a04ca7 100644
--- a/repository/TiddlyWiki/Tiddler.class.st
+++ b/repository/TiddlyWiki/Tiddler.class.st
@@ -136,6 +136,11 @@ Tiddler >> customFields [
 	^ customFields ifNil: [ customFields := Dictionary new]
 ]
 
+{ #category : #accessing }
+Tiddler >> deleteUid [
+	self customFields deleteKey: 'uid'.
+]
+
 { #category : #accessing }
 Tiddler >> exportJSONFile [
 	| jsonFile |
@@ -155,7 +160,7 @@ Tiddler >> exportSTONFileInto: subfolder [
 	| stonFile output dashedTitle sanitized |
 	dashedTitle := '-' join: (self title substrings collect: [ :each | each ]).
 	sanitized := dashedTitle copyWithoutAll: #($¿ $? $! $¡ $/).
-	stonFile := self wiki file parent / subfolder / (sanitized, '--', self uid, '.ston').
+	stonFile := self wiki file parent / subfolder / (sanitized, '--', (self uid copyFrom: 1 to: 5), '.ston').
 	^ MarkupFile exportAsFileOn: stonFile containing: self asStonStringPretty
 ]
 
@@ -458,13 +463,19 @@ Tiddler >> type: anObject [
 
 { #category : #accessing }
 Tiddler >> uid [
+	^ self customFields at: 'uid' ifAbsentPut: [ self uidGenerator ].
+	
+]
+
+{ #category : #accessing }
+Tiddler >> uidGenerator [
+
 	| tempId |
 	self created 
-		ifNotNil: [ tempId := self created  hash hex copyFrom: 1 to: 5. ]
-		ifNil: [ tempId :=  self class nowLocal hash hex copyFrom: 1 to: 5 ].
+		ifNotNil: [ tempId := self created  hash hex. ]
+		ifNil: [ tempId :=  self class nowLocal hash hex ].
 	self customFields at: 'uid' put: tempId .
 	^  tempId 
-	
 ]
 
 { #category : #accessing }