FWIW I will set things up so I can use big-big and small-small. Saying 'never' would mean I have to give up on using the big/small cog on the back. Others may be situationally aware but I'll stick with the limit screws and thread locking compound along with a Goldilocks, just right, chain. I guess Murphy will still apply.

Speaking of Murphy I would like to claim the Godwin's Law version of Chain Lubrication and call it Chorlton's Law. I do realise there is prior art but I am just going to plagiarise and name it.

So.... about that chain lubrication thing?