Replacing WalthersTrack Turnout Snap-Action Spring

1.  Make sure the spring retainer plate on the underside of the turnout is removed. If the plate is still in place, carefully pry it off with a small, sharp bladed screwdriver or knife blade.
2.  With the turnout upside down, use a small flat-bladed screwdriver to hold the throwbar steady. This can be accomplished by inserting the blade of the screwdriver between the throwbar and the ties next to it, as shown above.
3.  While keeping the throwbar from moving, use a pair of tweezers or needlenose pliers to grab the snap-action spring and place its legs into the mounting holes. Carefully apply pressure to make sure that both legs are firmly seated in the holes. 
4.  Replace the spring retainer plate by positioning the holes in the plate over the two mounting pins. Press the plate down to make sure that it seats securely. NOTE: The cover must be installed prior to operating the turnout points to avoid the possibility of the spring coming loose.

Video: How to replace a WalthersTrack turnout snap-action spring