Brompton Bicycle Seatpost Sleeve
The Brompton seat sleeve allows the seatpost to slide up and down smoothly. Over time it can wear and will need to be replaced.
NOTE: The sleeves are not a 'ready to fit' item. They have to be reamed with the Brompton reaming tool. Your nearest dealer should have this tool in stock.
Note: This should be held in place with rubberised superglue.