Which tool for front suspension ?

Hi all, greetings from Scotland.
I am wondering if anyone can tell me which tool I need to open the top caps?? On my front suspension (to take out the long springs, clean and re-grease . I've watched a fewvyoutube videos and one guy made his own tool and another guy used a pin spanner normally used for the bottom bracket, but I have not found out what the proper tool is to be used.
I have a photo but I'm not sure how to post it. But I'm sure you'll know what I mean.
I am wondering if anyone can tell me which tool I need to open the top caps?? On my front suspension (to take out the long springs, clean and re-grease . I've watched a fewvyoutube videos and one guy made his own tool and another guy used a pin spanner normally used for the bottom bracket, but I have not found out what the proper tool is to be used.
I have a photo but I'm not sure how to post it. But I'm sure you'll know what I mean.
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Some of mine use a big socket, ring spanner and one set I use a chunky shifting spanner.
There is no secret ingredient - Kung Fu Panda
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Parktools
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
That's a bit sexist. Chicks ride bikes too.
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools