This may be off topic, but I saw in your profile that you ride a premier. My advice as far as fins is to just take them off. With the premier, it rides way better without the center fin. Try it once and you will see that the fin has been holding you back rather than helping. If you still want to try and grind them down, use a grinder, but lock the fins in a vice first. And go a little at time....Better too little then too much. But seriusly, it is more trouble than it is worth, just take them off.
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