File my cranks for bling or get one that fits?

BigLee1
BigLee1 Posts: 449
edited February 2012 in MTB workshop & tech
I`ve bought a middleburn middle chainring and it doesn`t fit my FSA cranks so, do I just take it back to the shop, 40 miles round trip, or do I file the 1mm off each arm so it does fit?

If I do will it conspire to kill me? the bloody thing fits where the outer ring goes perfectly :(

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