I just did this front coupler mod on a 149, and the driveshaft does not have to be cut, but you do have to drill a new hole for the spirol pin. It cost less to buy the QL parts to change the front coupler, than to buy the stock 129 (and below, hydro models) coupler/drive hub. It's not a lot less, but is cheaper, and you also shouldn't have to replace anything again. The slot in the new stock replacement coupler/drive hub will wear in a short time.
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