Thats funny Norm, I have the straight shaft end off of one of these (Made a bitsa at the tip from the Straight shaft rover lower shaft and Full crank Ryobi head).
Mine is tight at the bottom once the shafts are connected - must push the inner cable tight a bit.
I ripped apart the head and completely re greased with bearing grease (theres no grease port) - it helped a bit.
