Yes, and like John said, remember that the pen body length MUST include the entire length of the INSIDE of a standard pen. What I do is drill the blank with the proper drill bit for the body tube, then take a long 7mm drill bit that I have marked to the length of the inside of a finished pen, lay it on one side of the pen, and with a marker, mark on the outside of the pen where the drill bit reaches to. The pen blank MUST be at least a little bit longer than this point. Then put that bit in the drill press and drill the 7mm hole to the point of the mark. The 7mm hole will hold the spring decently and easily fit the refill in.
when I chuck up the blank. I mark the point on my toll rest that matches up with the mark I put on the side of the blank, and always remember that the whole in the wood reaches to that point, so you should NEVER turn off any part of the blank near that line!!!