Don't Lock It
I agree with the others.Don't lock your outboard. The boat can turn on a dime when you swing both outboard and tiller together - the time WILL come when that is desired.... high winds at the dock, swinging towards somebody's $100K boat.... close quarters in anchorage and you break loose from bottom..... dropping something overboard....By the way - how you do you find your reverse thrust? I also use a Merc 7.5. Reverse was absolutely terrible. The through-prop exhaust fumes caused untold cavitation. Guy @ marina here suggested drilling two 1/2" holes through exhaust housing, just above cavitation plate, one on each side. Did that ever do the trick! Get great reverse thrust now without having to crank the rev's up. Happy sailing!