(I Currently have no Midships cleats at all)
A Big OUCH!
I wonder how you do a quick single side docking for fuel or eats?
My midships cleat is almost a necessity. We do single line berthing with that cleat, but ours are OEM.
Someone used our "boarding line" that is extra line[at midships] to pull the boat to the finger pier. That extra line was left tied up to a Bollard cleat. Tide went out... Guess which cleat gave up?
errr...
not the Hunter OEM cleat.
So the backing plates are designed for the weight of your boat on a new cleat.
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Without midships spring lines....
1) Brown sterns for sure
2) Blue Bow lines for sure, but I don't think a "spreader" is needed.
3) To board, release Port side Blue and pull with Starboard Side Blue to finger pier
4) To dock, throw Bow Blue to landlubber or kiss dock and grab the Starboard side Blue. Set the Browns, exit boat, set the Blues.
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The real "kicker" is a bit of Trigonometry, since I don't see the Actual Scale of your boat and the width and length of your berth. That Trig is the High and Low tides and the angle of the Brown and Blues.
For example: At Mid Tides, your boat may hit the finger pier or the neighbors boat, with the slack in the lines.
Jim...
PS: I had to do Trig for Hurricane Nate's expected 10' surge and allow enough line for my boat to rise, without hitting the Bulk heads on either side of the Canal, after the surge passed.