Its been a while since I fooled with mine but there was an update kit for the clutch and if memory serves me correctly it eliminates the ball because the needle bearing you have on the end of the rod will perform the function that the ball used to. Look at the clutch diagram for the 1989 TRX250R and compare it to the ATC. I think someone may have already done the update on yours so the ball is no longer needed.
John
1985 Eddie Sanders ATC330r
1986 Monstecate
1984 ATC70 (awaiting 125cc transplant)
1984 ATC125M
1986 GSXR 750 - Keepin' it old school!
1999 Arctic Cat 500 4x4 plow machine
1999 Arctic Cat Thundercat 1000 (lake lizard)
1996 Arctic Cat Jag 440 L/C (ditch banger)