The splines are there, I can see them. Time to break out the penetrating oil. If it were me I would open the jaws on my bench vice enough to fit the jackshaft through and suspend the assembly by the pulley. I would then moderately wack the end of the jackshaft using a scrap piece of wood in between the shaft and hammer. If I didn't have a vice I would hold the assembly upside down on a scrap piece of wood and moderately wack the back of the pulley with a rubber mallet. It will come free, you just got lucky on the other one.