I hav a blank 920T and I am going pin down under the middle finger and I wonder what surface changes people have done.  If the question sounds familar, I've asked the same questions on the break out.  I have a break out as well.  My goal is to check the response of the ball with coverstock changes.  Medium conditions are what I think it's likely to see but  I wonder if it can handle heavy oil with a surface change to 1 or 2k?  I am not looking for sharp angles..just strong, continious arc.