A little work but it came out good. First I bought some 1/2" caulking backer @ the hardware store, it's pretty much like the swim noodles, and cut it to 1" increments. I weighed out exactly 100 grains of #6 lead shot and got the glue gun hot. Push the backer down the point end of the shaft about 2 inches and pour in the shot, you will have to force the insert in so make sure it all fits really tight. Now put in 2 squirts of glue and push the insert in quickly. After you have done this to all of the arrows get a welding torch going and hold the shaft with the point end on a 2X6 and heat the bottom 2 inches until you can't hear the lead rattling inside, this means it is melting. Now slam the head stright down into the 2x6 to seat the glue and lead right up against the insert and quickly quench with water. This took my 2016 @ 29" right to 590 grains wich is exactly what I was lookin' for. It sure would have been easier to buy some 100 grain adapters and glue on heads but I've never been one to do something the easy way when I can do it the hard way.