There's a reproduction of the G41 tool on ebay from Historical Parts Co.
Look up 'Walther G41 Reroduction Disassembly Tool'.
I bought one, and it is very nice.
Removed the safety lever from my DUV G41W to replace it and noticed it has no markings on it.
Thought the Germans marked all these parts with either the 214 or 359 eagle.