Yeah I have a similar situation except mine are old cranks with the nut where its attached to the front chainring rather than cotters. Going into a Bottom Bracket which needs a lockring. Mine had two chainrings and I drilled off the smaller so that means the existing chain ring sits out a bit further too. Sorry no help to edmundro but I'd appreciate what suggestions people may have.
Yeah I have a similar situation except mine are old cranks with the nut where its attached to the front chainring rather than cotters. Going into a Bottom Bracket which needs a lockring. Mine had two chainrings and I drilled off the smaller so that means the existing chain ring sits out a bit further too. Sorry no help to edmundro but I'd appreciate what suggestions people may have.