Wiper wheelbox nuts are of two different patterns and threads. The six-sided nut can only be used with the original wiper wheelbox on the TR5/250. The eight-sided nut is used only with TR6 original wheelboxes. Attempting to fit the wrong nut will ruin the thread on the wheelbox. Wheelboxes are not interchangeable betwen TR5/250 and TR6 with ease. This is due to a different ratio wheelbox and wiper motor gears.

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