Shimano M700 AKA / Overbury's Crossfell / Deerhead headset tool ........do I need one?? can I improvise?

Darcus

Retro Guru
So I've just acquired this original Overbuys Crossfell with the said headset on it, and would like to service it.....question is though how to I undo it with what looks like a special tool? Anyone done this before? Any tips gladly received! Thanks
 

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There is a chap in Poland (IIRC) making some reproduction spanners for these at not too much money. They are better known as a 600 EX headset spanner I think.
 
32mm spanner/ socket

 
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