Make a spring clamp out of a thin piece of non marking metal. I usually use a small strip of brass about 4" X 1/2" x 1/8" thick just because I have a supply. Bend one end over & file a notch in the end wide enough to hold the spring in compressed position. Compress the spring in a small vise or by using a spring vise & slip the clamp over the compressed spring. Insert the compressed spring into position & gently remove the clamp allowing the spring to lock into the appropriate recesses.