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SJS is the reputable place for Brompton stuff, with riser you may need to buy a whole new cableset for an M type handlebar and trim it a bit shorter to get the idea length for the fold (especially on the rear), also the clamp is 25.4, the new handlebar need to be 22.2 all the way right to the clamp, as the Brompton steerer is notoriously tight if the bar is 25.4 at the riser part.
Lastly, you're right, just nip up the bolt on the seat clamp with a 10mm spanner and you're right as rain.
So what's the riser of choice for the Brompton s2l, preferably silver. Also replacement clamps where's the go to place now, dinokiddo? Sjs?
One last thing my seat post slips when I raise it, slides down a little bit at a time. I'm assuming I just tighten the bolt of the quick release, to remedy this..