Oil filler nut and tool

Hi

I need to replace my oil filler nut because the groves are worn and the gasket is leaking, what are the options instead of paying £8 for a tool to use it once?

How do you tighten it without wearing the groves off?
Also are the nuts the same for the alternator and dynamo stands?

Thanks
Craig

 

I believe the nuts are the same regardless.
You MAY be able to undo it using a pair of long nose pliers or make a tool.

 

Unless someone ham fisted got there first for a go.
These are rubbish unless you're careful and everything is tip top:


These work every time no matter how molested the nut is:

 

I made one using an angle grinder on an old socket but I do have lots of old sockets.

 

Long nosed pliers worked a treat once i cleaned the groves out thanks