A cheap and simple mod to cut down on maintenance:
13mm (half inch in AmericaLand) heat shrink
Super glue just a little bit on the yoke end of the splined half shaft, heat to shrink tight.
Slide other half shaft in and GENTLY heat to shrink to suit.
Obviously we dont want a tight fit, so keep checking they slide freely as you heat to shape.
""The Older I Get, The Faster I Was""