Full metal stop bridge for Full metal Clamp (Mk4 and 5) and Full metal Frame
The problem with high loads is that the wedge design might clamp pretty tight on the carrier block. The longer the ride, the more bumps, the heavier the load, the tighter it gets. Probably more of an issue on the Full metal Bracket than on the flexy plastic Brompton carrier block. To prevent this I finally offer this solution in the form of the Full metal Stop bridge.
The Full metal Stop bridge is screwed to the top side of the Clamp limiting how far the Clamp can slide down over the carrier block and defining the amount of preload. A little bit of preload is nice to have to prevent rattling. When putting the clamp on the bracket the Stop bridge should be just free from the carrier bracket's top side, but under load it comes into action and the carrier block will bump onto the stop brdige. This way it takes just a little tug to unwedge it from the Carrier block.
By means of the two M3 hex key screws you can set the gab between the top of your Full metal Bracket and the Stop bridge. About 1-2 mm is what you're aiming for when the Full metal Frame or Full metal Clamp is just clicked on the Full metal Bracket withhout any additional pressure. With a bit of pressure or load on the FmF / FmC the gab of 1-2mm will disappear and the combination should be virtually play free. When there's some play you might want to readjust for a bit more gab so it can go down a little further on the Full metal Bracket.
The same applies when using the Full metal Frame or Full metal Clamp on the plastic Brompton front carrier block, except the M3 screws don't do anything, it's the raised section in between the screws that bumps into the carrier block's top side and stops the Fmf / FmC from sliding down too far. Youmight need to move two or four M4 washers from top of the bidge to under the bridge to adjust the gab. With a bit of pressure or load on the FmF / FmC the gab of 1-2mm will disappear and the combination should be virtually play free. When there's some play you might want to readjust for a bit more gab so it can go down a little further on the Brompton front carrier block. When you changed the position of the M4 washers you might need to readjust the M3 screws when also using it on the Full metal Bracket.
So best start checking and setting the gab on the Brompton front carrier bracket first and after that adjust the gab for the Full metal Bracket.
Weight: 24 gram