hi there, my poor old mission 753. just ordered a new tweeter from mission, excellent service. now all i got to do is decide on one of the mids. it has a dent in it. no tears or anything, just a slight dent but enough to be seen very easily. so, i heard a long time ago that you could use a very thin needle which has been bent, and insert into the cone and pull it out. is this possible? or are there any other suggestions to fix this dent? the speaker plays fine you see.