I am building a Model III and have been following the manual to the letter. When riveting the spar inserts in place the manual says to use a round file to gently spot face the outside of the spar to help seat and strengthen the SS rivets. That's what I did. This morning, I'm cruising the Kitfox site and happen to read the online portion of their assembly manual for the wing. In bold print is says, "DO NOT use a file on the exterior or interior of the wing spar". Is this going to be a problem?