Has anyone successfully refoamed a Phase Technology 8' woofer? I see others have fixed smaller drivers in the bookshelf speakers. I have a pair of PC 6.5 speakers in good shape other than the foam surrounds on the woofers, but can't find the right sized surrounds anywhere. Most have too small of an OD (needs 7.75-8.0) and too big of an ID (needs <5.25), and would just fall through the gap between the frame and the cone. Phase Tech wants $90 each for new drivers, far exceeding the $60 I paid for the speakers...