Question: How to tighten tension cable

[julia supanich]

Hi All,
Wonder if anybody has input on how to tighten the

tension cable

after the yurt has been erected. Failed to consider that the walls are about 1.5 inches in from the 8 foot radius of my deck, so consequently the cable is approximately 11 inches loose in circumference (2 x pi x r). Wups. Looking for a low-tech, sans come-along way to get her tightened. Thanks in advance for your feedback!