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Okay let's see if I got it right......You are a park skier....your edges are worn to nothing....and you want to fix them.
If the above is correct then don't worry....I round my edges on purpose specifically to hit rails...you need not worry about sharpenning them....they are park skis right? You are lucky that they are not cracked or ripped out. Just keep shredding and forget about it. Getting attached to your park skis is useless, they will always succumb in one way or another so just ride them as long as possible...