http://www.sears.com/shc/s/p_10153_1260 ... 000P?mv=rr
http://www2.northerntool.com/hand-tools ... sets-1.htm
http://www.northerntool.com/webapp/wcs/ ... Bdie%2Bset
yes you'll eventually find these sets almost in-dispensable, you won,t use them daily but cleaning out threads before assembly and the use of anti-seize on threads will eventually become almost a habit
"there is a difference between a thread chaser and a tap. There are actually three types of thread cutting taps for each size threads. A taper tap is for starting the threads, the plug tap is for making the threads go deeper/closer to the end of a blind hole, and a bottoming tap is just that, for getting closer to the bottom of a blind hole. A thread chaser is made different from a tap in that is does not have the sharp cutting edges, the flutes ground into it are not as deep. A thread chaser is for straightening out or cleaning out threads in either an open hole or blind hole. The body of a thread chaser has more metal in contact with the threads already cut into a hole therefore reducing the chance of cross threading"
http://www.jegs.com/i/JEGS/555/80505/10 ... tId=751008
http://www.carcraft.com/techarticles/th ... index.html
http://www.automedia.com/Thread_Repairs ... 021201tr/1
http://en.wikipedia.org/wiki/Tap_and_die