I just noticed when locking my bike up at work this morning, that I have a loose spoke. I haven't checked properly, but I think it is only the one spoke. Is this something that I can fix myself? I have the Lidl tool kit with a spoke tensioner in it, can I use this and just be careful not to over tighten it? Will I still be okay to cycle home with it? I don't know how long the spoke has been loose for.