If you look at the earlier posts, no one used a clamp on the flat llid. No need to. It just wasn't needed. Keeping the UDS simple, without too many overthinking what to do, will serve you well. Try lthe most primative and simple UDS build and the change what you want. Just a thought bros!
my avatar swiped fatties from the plate....look how sorry he is.
NB Bandera with mods
Weber 22 .5" x 2, 26.75" x 1
UDS x 3
Created "The Great Spam Revelation of 2011."