so i installed a hdd in the optibay in my mbp. the only trace of doing this job would be some small markings on the screws used to hold the optical drive in place. would apple notice this and use this against me or could i argue the fact? also, is it still worth buying applecare? and lastly, is there anyway i could purchase the exacts screws from anywhere so that if i need to take my macbook in to the store i could just install it with new screws?