You could use the UST MP6 iron shafts for the Callaway Fusion Irons. The rule of thumb when reshafting a bore through iron is to subtract 1" from the recommended trimming instructions, assuming you can, to maintain the flex of the shaft. Failing to do this will make the shafts play almost a full flex stiffer then what is listed on the shaft. Callaway bore through irons use a .370" parallel tip shaft but then they cut slots length wise in the tip end of the shaft to compress the tips down to a .350" size. These are not the easiest reshaft.
Date published: 2016-04-04