I have a fat bike on the way that uses the 750W rear hub motor. I just recently read that the cassette removal tool will not fit over the the nut and washer on the drive side. One solution was to grind them down until the tool will fit over them. Is there a special tool or another solution to changing the cassette on the freehub of the bafang 750W? The motor has been around for almost 3 years. I would hope there is a solution.