Rear Shock Adjustment

[MikeBike]

Hello Guys.
I don´t have the original tool kit. I wish to adjust the rear shock. How can I do it without the the wrench that was on the tool kit? Do you use any conventional wrench without damaging the shock?
Suggestions accepted.
Thanks
Miguel
FZS 600 1998-1999

[NorthWestern]

You can knock the ring around with a rod or large screw driver but it's not ideal.  Just get a c spanner off ebay.