I don't have a good closeup picture, but here http:__www.wheatfarm_farmlife_photo8.jpg should give you an idea of the setup we have. The inner rim has a series of holes on the flange that you can put eyebolts in. Then a bunch of toggles with long hooks latch on those eyebolts and a lip on the outer rim. Once the tension is set evenly all around, you lever the toggles over with a big pipe and the outer rim is held secure.