Thomas,
My Atlantis 2006 has Tektro Oryx cantilevers. I have broken 2 springs
already. I found in McMaster some torsion springs 9271k681 for right hand
and 9271k615 for left. They now cost about a dollar apiece. they come 6 in a bag.
They were put in service 8 years ago. No problems. Your springs might be
different.
Pete