Gene,
Check out Micro-Mark or Internethobbies or Internettrains on line for a better price for those nippers.
Also, what the guys are talking about is called an "easement" in the curve. You don't just jump from the straight to the curve as you do with snap track.
Example: With snap track of a fixed radius, let's say 11", you are on the straight and all of a sudden you enter the constantly curved 11" radius piece of snap track. It's like taking a "Sharp" left turn in your car. You always feel the G force pushing you over to the opposite side of the car.
With flex track, you ease into the 11" radius by actually plotting two 11" radii. I know this sounds confusing, but bear with me.
1. Find your center point and draw your first radius tangent to your straight track. That just means touching a line extended straight in the same direction as the straight track you want to curve away from. Now you have something that looks like a big letter "b". Get it so far?
2. Now mark another center point 1" to the right on a 90 degree line to the straight track. Think letter "b" above and the new letter "L". You now have two center points on the short leg of the "L" 1" apart. Draw your second 11" radius circle. You now have two overlapping circles.
3. Next, draw a straight line tangent, touching, the bottom side of the two circles, in this case horizontal, 90 degrees to the extended vertical straight line. You now have a new large letter "L" touching two lines on the bottom and on the on the right.
4. Mark the point where the new straight line touches the second circle with a nail or stiff pin and also the point where the original straight line meets the first circle.
5. Now comes the fun part. Get a flexible flat stick of sufficient length to be bent and fit between these two pins. I happen to use a piece of 1" wide by 1/8" thick by 36" long basswood from the airplane dept. at the hobby shop. Pin one end of the stick on the centerline of the straight track for a length of about 4", then bend this stick to the point that it is straight on the new leg at 90 degrees. You will see that the curve is now more gentle than just snapping into the first 11" curve which is what snap track does. Draw a line along the stick and this is your new curved track centerline. What you have is a composite of varying radii that will only be 11" somewhere in the middle of the curve. The beginning and end will be naturally larger.
6. Now here is the best part. Once you have drawn your first 11" centerline and then marked off the extra inch as above, with practice, you can just let your flextrack take a natural easement by holding it just at the free end when laying track.
Now that I have totally confused and befuddled you, have a good day. Take two asperin and call me next year.
B-)