> I've always been told that you should undersize the ferrule .002-.003,then bring the wood down to match. When using pre-fab ferrules,this is a LOT easier. McDermott has their ferrules cut to .510,when installing on a brand new shaft blank that is turned to .512 or so,all it takes is a bit of sanding with 600 paper and it comes out perfect. So far,I have only installed 10 screw on type ferrules,all were made from solid rod. I drilled,bored,and tapped them,then changed my set-up a little. I used a standard 5/16-18 lathe pin,and screwed it into the ferrule. After moving my live center up to the ferrule,I indicated the ferrule and took several small cuts. I measured the shafts several times,and took the ferrule down to .002 over finish size,then sanded out to 400,then installed them and let dry. All of them fit very nice,and minimal sanding was needed to match them up perfect with no ridge or swell. It is probably best to do this final match with the lathe turned off,sanding with the grain,and using a flat paint stir stick or something similar to keep the surface flat. Tommy D.