as little as possible basically, any play will result in slop in the linkages. obv dont want it so tight it binds tho.
missinglinkz in the US sells poly balls, which reduce the play and wont ever wear. Also try not to have any play between the ball & the shaft itself, I put a missinglinkz ball on my MK2 Golf but there was still play between the inner plastic bit and the shaft, so I packed it out with tape. Much better
