i do. 1. electrical tape over the original 2. overgrip over the electrical tape both just add 1.3 - 1.5mm thickness to the original which i find still comfy.
Just bought a At600, and had an overgrip on it from the shop, on top of the original. Have also put another overgrip on, and still think it's a little on the thin side!!
I do for the top half of the handle. This is so that I have a thicker grip nearer the cone and a thinner one nearer the butt.
I do that not for extra sweat absorbing but for a bigger grip size. My towel grips are thin and I have an overgrip on the replacement grip before I put on the towel gip.
I just tend to have a Karakal grip underneath an overgrip. I always remove the original grip as it seems so pointless being there. Its so thin it might as well not be there for me. Seems a bit daft to overgrip your overgrip. Though i suppose if u want a certain racket and can't get the right size handle then its works.
Hey just wondering, whats with the extra electrical tape? And i do the same but Lin Dan style i only hold my racket at the bottom so mind as well save half a grip?
If you don't put tape over the original, when the times comes to change the grip the adhesive will stick to the original grip making a mess. I use sellotape or shrinkwrap so its easy to change grips
to maintain the original appereance of the racket I always use a yonex overgrip [Yonex Super Grap Overgrip (AC102EX)] the advantage of this grip: easy to assemble and easy to remove without destroying the basic grip especially for the rackets of yonex. if you still feel that you need a bigger handle just add an overgrip you like over the AC 102 EX so you needn´t put so much effort in removing the overgrip p.s. I would be careful if you use towel grips. if you wrapp it till your shaft it might damage your paintwork like by my AT500 before so be carefull maybe I also was too impatient