In reply to simonukcH3Dw:
i think you can slide the nut in between the plate and the crampon,into the slot under the red arrow. You can then add the screw and tighten without cutting your anti-balling plate. The screw might push on the plate but this won't be a problem.
You could also undo the front clips of the rear plate by pushing a flat head screwdriver underneath the clips and gently levering them towards the front of the crampon , add the nut and screw, then clip the plate back on. That should be a bit less fiddly than the first option.
If you can't manage either of these options then take them to a good climbing shop and ask them to do it for you.
I hope this helps