Reason 1., easier to replace a faulty u joint with u bolt yoke/flange
Reason 2., I sent the only spare yokes I own to my BIL for his daughter's disco. So I have only a shaft and its spiders.
Reason 3. I have a set of u joint yoke flanges from the old 109 mess.
1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
All my troubles are Rover