Hey Jim,
Nice to see the SC in good hands. The tension hooks do tend to work loose over time, just tighten them evenly 1/4 to 1/2 a turn at a time and use the clock face method of tightening. I'm sure you know how to do that, but google as always is ready and willing to help. I hope you get many years of enjoyment out of the instrument.
Kind Regards
Dennis (Currently at the bottom of the South Island)