On my Brompton. also, .. which has a 1.25" seatpost (31.75mm) I altered a 31.8mm QR band clamp for frames, taking a lip off the inside edge,
and slide it down the seatpost itself..
to fold the bike I have 2 QR lever sitting on top of each other to open..
I'm 215 # FWIW..
...
Last edited by fietsbob; 06-14-20 at 09:53 PM.