fuel injetor leaking on 1990 Ford F-350

I had a few injectors on the same side leaking and bought the after market kit from nappa. the person replaced the caps and fuel lines only. Now the minor leaking is major. I found the box realised he didn't use the o-rings and now am having to change them my self. My question is what is the best method to remove old rings? Without damageing the injector (nicks)

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