I removed my 40 year old D130F woofer from my cabinet and found that my aluminum dust cap is quite crinkled and I think it may be what's causing some upper mid-frequency harshness I've been hearing. Other than the dented and crinkled dust cap, the speaker is in great condition. Does it make sense to take the speaker to a service center and just have the dust cap replaced or should I go ahead and get the speaker completely re-coned?