"While on the trailer... HAve
"While on the trailer... HAve someone hold the steering wheel steady while you try to move the drive side to side. Among the places to check for play are: the pivots to the transom shield, the point of the steering arm that the steering cable attaches to (inside boat at the transom), wear in the head of the steering mechanism itself, in addition to... the end termination on the steering cable being loose."
1969 23ft ChrisCraft Lancer
Merc 5.7L 260HP/ Volvo 280
1972 22ft Bristol
Honda 7.5HP 4 stroke Long shaft