Hello! New to this forum and this is first post I am doing a service of an AS 2063 movement and hit a little snag regarding the mainspring barrel. I have never been able to open these types of barrels gracefully, always leaving marks which annoys me, so i thought to ask people with more experience than me So what is the secret to open these? I want to open it to replace the spring and clean it, seem like the previous owner thought it could be repaired with WD40 , literally the who