I resently got a SD deck for my Walker. My walker is a 1994 and has the older square shaft. The new 48" SD deck has the new spline shaft. I had the guy order me a new style spline driveshaft for my walker and my old deck. He then told me later after I got the deck that it would be better to convert the new deck to the square shaft. The new deck is also tilt up and the old deck is not. I have the square driveshaft he ordered me but it doesn't even go on the deck gear box. Also it is a much different design. Anybody ever done this? How did you do it?