The latest addition to the SideWinder Rewind is my version of the Kamoya Stick of which functionality I managed to deduce from Kamoya pages. It is basically an extended seat stop. If you lower the seat just a little bit, it will lock the fold and you can parade with your folded Brompton and the seat up, using it as a handle and not risking the unfold when rolling or lifting the bike over any steps and not needing any straps to keep the fold together.. Kamoya offers their stick cheaply, but only to Japanese buyers, so I had to attempt a reproduction.