How can you lock up a kayak that doesn't have a security bar?

Question

I've got an idea, but It's a little more chain intensive than I would like. I need to store two kayaks outside in a city backyard for a month.

Answer 1

I tie a long bike cable around the inside seat brackets.... That works.

Answer 2

You may have to attach an eye bolt in some out of the way place. That would be the cheapest way.

Otherwise, you could use a rod that screws together (long enough to not be pulled out)  Put it together in the sitting space, then place a sleeve over the joint and lock it, and run the chain under it.