Hello. I have a K30 ex-army and a problem. Last night was on a nice wet meadow and didn’t come any further. I thought half so bad, I have four wheel. Pustekuchen! I put the freewheel hubs on lock, inside on 4H and even on 4L but nothing does. Except the rear wheels. Is already embarrassing if one gets stuck with such a car on a wet meadow already. The freewheel hubs I have already unscrewed and looked after. The functioning perfectly. Where could you look again? I hope for a little bit more. Thank you very much.