Originally Posted by champy511
...Fed was being very vague about his racket, but he did say something about doing something to the inside of his racket. I have not been able to find that interview online
He didn't say anything of significance other than they try are open to trying different stuff including weight, strings, materials etc. - i.e. basically his way of saying he remains 'modern' but without actually saying anything specific.
Original Pro Staff 85, leaded to 370g, hybrid poly/syn gut set-up, 48-52-ish lbs.