I'm not too keen on melting some threaded rod into a stock because you are not going to get the accuracy for setting the pillars into your stock properly. Also what is the plan for accurately drilling holes in the threaded stock for the receiver screws after the rod is in place?? I would suggest either making your own pillars out of metal tubing or ordering a set of pillars from Brownells, and either glass bedding them into place or even using JB Weld to epoxy them into place. JB Weld is something that I have never used, but wouldn't hesitate doing; both systems ought to work for you. I set my pillars to sit hitting the bottom of the receiver, and have the pillars sitting .005 thousandths of an inch high where they meet with the floor plate. If you order pillars, I would suggest getting Brownell's rifle bedding studs also. Brownells also offers adjustable pillars that can be adjusted to the proper height before they are epoxied into place. I would also glass bed the barrel and free-float the barrel from 4 inches in front of the recoil lug. I have several rifles that I have built with this process, and all shoot very well with the original stocks. Good luck with your pillar bedding job.