I recently acquired a CVA Mtn Stalker from a yard sale and it is missing the ram rod. A few questions I have is, do I measure the inside of the ramrod tube to see what size rod I need to get to make a new one. Also how do I determine the length I make it. I do want to get separate components and make my own. I've been looking online at rod blanks and which ones should I stay away from. I know I am looking for straight grained rods with little to no run out but which places have the best chance of getting good rods from. Thank you for the help in advance. Brian