Originally Posted by
budgee
The thread of the nuts are drilled smooth so that they act as washers. Either that or buy slightly bigger nuts so that they cannot be screwed on the threads, they have to be loose to enable the tightening of the bolts to the frame up to an adequate torque to withstand the weight of the bags.
Thanks much for the infos + pictures. I did a mash-up:
Instead of piling up several nuts, what about carving out the inside of the Brompton block so that it will fit the welded part on the headtube?
I'll wait for
bike.gang.uk's adapter and compare the two solutions before possibly modifying my Brompton luggage block.
Hopefully, the part welded on the headtube of Dahon/Tern will be able to carry a T-Bag even when screwing a Brompton luggage block with either of those solutions.