I took my k4 to a fellow rider that owns an auto repair shop, to have him mount my new tires. The rear was a breeze, but the front is a different story. He made a tool to fit in the hex opening, and after loosening the securing screws, tried with all 240 lbs of himself to loosen the axel, but to no avail. Does anyone have a suggestion for loosening it, or a reason this is happening?