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Well first off, your question is very vague. My question is, is this "w" a logo type molding or is it melted into the end cap? If you have a Miken bat with a W melted into the end cap, then it is a NR bat. (Non-returnable).
Carefully remove the end cap of the bat with a flat head screw driver.Flip the end cap upside down on a flat surface.Pour 1 oz of pourable polyurethane into the end cap and let it dry overnight.Place a small amount of epoxy around the edge of the end cap and press it back into the end of the bat.Let the bat sit overnight (again) with the end cap on the ground to ensure the polyurethane settles completely inside the bat.Note: End loading is illegal in all association softball and should only be used for exhibition or practice. End loading extends the sweet spot and can increase the the exit speed of the ball.
Usually by prying them off. I've found that the higher end bat's are usually more difficult to take off. Try a heat gun to loosen up the glue and to expand the bat from the cap.
drill out the center fill it with lead and resael the end
Yes because it's wider near the top end and skinnier at the bottom.
Yes, they can be rolled after being end loaded. When you roll a bat you are rolling the sweet spot not the entire length of the barrel.
A bat is shaved by removing the end cap then using a cutting tool and a lathe you would remove material from the inside wall of the bat.