Well I just sort of threw out the "collapse" thing as an example. It does have a ridiculous amount of rake and reversing it takes it pretty close to the downtube. I do worry that flex might cause it to stop up against the frame. No well to tell without trying, I suppose. I need to dig up a caliper and give it a shot. Or I suppose I could just disconnect the front brake for the nonce.

Thanks for the locktite suggestions. I thought about loctiting everything, but someday I might actually want to stick a new built up track wheel on there and it would be cool if I could get the cog off..