Thanks for all your help in my previous posts about changing grips and cutting the shafts. Now I am into the stage of putting on the grip. (I havent bought an air compressor yet so I just cut out the old grips....)
However, I am getting a little bit lost as to which grip and how many layers of tape i should put on. I am changing my iron set grip and the previous one were standard Titleist Golf Pride M580R (.58 of an inch right?). The funny thing is, I measured the shaft and am pretty sure that it is 0.6 of an inch a the butt end. So I went an bought these Golf Pride Tour Velvets M60R (I have just figured out that R stands for Round). So I put one on my PW to try it out, with two layers of double sided tape (I think they are called Buffalo tape or something) since I want it to be a little bit fatter. To my surprise, the thickness turned out to be exactly the same.

Before I proceed and do my other irons, I really want to make sure that the thickness will be right and consistent across all my irons. So I have these questions:

1) What is the actual diameter of my shaft (Standard DG-S300)? I have noticed that the shaft thickness stays the same towards the butt.

2) Based on that, which grips should I be using? I have already bought a bunch of M60R so I do hope that i can still use them.

3) How many layers of tape should I use? My hand measurements are 8inch(20cm) from middle finger to wrist and my middle finger is about 3inch and 1/2 (8.5cm).

4) Should I be using double sided tape? They were recommended to me by the golf shop that I bought a grip replacement kit from (that liquid to spray inside the grip to make it temporarily slippery). I do want to be just change the grip using air compressor in the future....

Thats all the questions I have for now...Again, thanks in advance for all your great help.

Matt