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Seems like i need to file the wheel axle as it is too big for the fork.
The supplier has clearly sent you the wrong axle size. From the Swytch website:
"Fork Dropout Width: 74-80mm (fits Brompton and other folding bicycles with narrow forks e.g. Dahon)"
They should also cover the return postage, as it is a supply error. I note that they are listing no stock available for the Brompton compatible model.Personally, I would not install either a hub brake or a electric hub in a front fork that had not been built to handle the additional torque. In the case of the standard Brompton fork, it does not even have forged dropouts but rather just a compression and shaping of the actual fork tube.
Seems like i need to file the wheel axle as it is too big for the fork.