[Alan Douglas]

Put a little Elmer's glue inside the cap. Pre-tin the wire coming out of the tube. Place the cap on the tube and rotate it until it fits snugly (I'm assuming the old cement is still in place inside the cap. There will be one "best" position, where the cap was originally). Now use a hot iron and add a little solder to the depression in the top of the cap, where the wire is poking through. Do it really quickly. Then let the glue set for a day.