in response to the a question on the NCRS tech site
How do I install the spring in a 1963 and later fuel overflow hose.

The following 42-second video will demonstrate this technique.

1 Get a stiff metal rod that will fit inside the spring. A very long shafted screwdriver will also work. Preferably the rod should be as long as the spring, however a slightly shorter rod will suffice. A 3/16-inch diameter rod is ideal. The rod should not have a sharp tip, to prevent scratching, damaging or puncturing the inside of the hose or your hands.
2 Place the rod securely in a vise and drop four 1/4-20 common hex nuts on the rod.
3 Use needle nose pliers to bend the tip of the springs last coil inward so it does not drag against the inside of the hose.
4 Spray the inside one end of the hose with a lubricant like SillyCone. Don't get this lubricant on the outside of the hose. Do not inhale the SillyCone spray. The spring can also be lubricated with SillyCone.
5 Slip the hose over the rod and gently compress the spring so the coils are touching. Firmly grip the hose, close to the vise end of the hose. Do not grab the hose above the tip of the rod or you may puncture the hose and your hand. Wear heavy leather gloves for grip and to prevent puncturing your hand.
6 Continue pushing the hose over the compressed spring. As the compressed coils are inserted inside the hose, they will naturally spring back and un-compress to a degree inside the hose. However the inserted spring will be shorter in overall length than a free spring, once it is completely installed.
7 Repeat step 6 until the spring is completely inserted into the hose.
8 Remove the hose-spring assembly from the rod.
9 When finished 1-2 spring coils may still be visible protruding from the tip of the hose as some originals overflow hoses exhibit. If your original overflow hoses had the spring completely inserted with no coils visible, repeat step 6 until 1-2 hex nuts are pushed into and stuck in the end of the hose. Then use a pick to pull the nuts out of the hose.

CAUTION: Wear eye protection to prevent eye damage. Do not operate the vise, rod, spring, hose, pliers or SillyCone after using alcohol or drugs.

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"A Stiff Rod Answers the Call"