If you are putting a kit together that requires alot of metal grinding/polishing get a Dremel tool!
I've spent alot of time filing and sanding the parts to my Lyman kit with no hope of finishing in sight for a long time. Last night I bought a dremel tool and finished all of my metal parts in about 2 hours time. This probably saved me several weeks of time<img src=icon_smile_cool.gif border=0 align=middle>