Have a new 6 hp 4 stroke outboard . The tension levers have holes that do not line up to insert a padlock . The new outboard lock I bought online won't work and the old outboard lock that I used on our 23 won't fit . Part of the problem is the width of the fiberglass where the motor attaches . What sort of locks are you using on your 23.5 outboards? . Some type of cable like for a bicycle might work . I know these only slow down thieves but if or when the motor gets stolen I would like to be able to tell the adjuster I had it locked .