I have played with the tour serious for about 6 years now and so I know what I'm saying. first of all, in stock form, the tour serious are to head heavy plus they are extended length making it way to hard to whip around for top spin. the good news is its a great racquet and it can be modded to be a top spin machine.
right now the racquet is about even balance 11.0 ounces and you want it to be 8 points H.L. and about 11.7 ounces (you gotta trust me on this)
1) take of the grip and butt cap and then cut of the extra .25 inches ( its pretty easy to cut and any hand saw will do ) racquet is now about 2 points H.L.
2) now that the butt cap is off you should see that your handle is foam filled. the foam is perfect for holding the nails that your put in the handle too add weight and make it 8 points H.L..
3) use 2 or 3 inch long nails or screws. weight out .7 ounces of them. now your ready to put them in. make sure you leave the nail heads still visible in case you want to pull them out later. try to put the nails in a balanced way. for example, if you have 2 nails, put one in each side of handle. ( the foam in the handle should be partitioned in half)
4) now check your balance? if still not H.L. enough use shorter nails or more nails till you get the balance your want. I had to cut the head bumper off to get mine H.L. enough. the k tour is just so H.H that was the only way. (don't scrape your racquet on the ground after you cut the bumper off)
5 enjoy ! you should now have a real powerful, and whippy top spin machine.
PS; rip control works real well with this stick. gives great spin.