Here Is a pic, not a very good one though.
I made it from a Murray deck spindle, shaft & pulleys.
The pulley end and blade adapter end of the shaft are the same. Put a deck pulley on each end of the shaft and measure the length between grooves, On mine was around 6", so I moved transaxle up in chassis same distance. line up lower pulley with motor pulley and you should line up pretty good with transaxle. Free, easy jack shaft.