I never meant to imply that lines should be taken through the cabin.
Sorry Bob about my misunderstanding. I didn't think you would do it that way, but just came off sounding like it.
So, Colby, when you took the lines to the outside of the boat, how did you. rig them to get the mid ships cleat line back to the cockpit?
Not sure I understand exactly what you are asking. The cleats on my boat are mounted in the aft quarter, and then just outside the forward windows. When working with a bollard, I have both a bow line (from just under the forward window) and aft line ready laying across where you would step off the boat. (When cruising, I always have four lines attached to the four cleats. The bow lines bitter ends tied to the hand rails on the back of the cabin bulkhead.) Once I'm in position, which ever side I lock on, I hook the two lines on that side over the bollard, and then just hang on to the lines, adjusting as necessary to keep the boat against the lock wall. Without bollards, but with lines that are dropped down from the top of the lock, I will grab one while standing at the front of the cockpit, move for or aft with my cockpit helm and kicker to grab the other line. Or many times if there are two lines to grab, the lock master/tender will assist in getting both lines to me. On the 22, I would get in position with my main from the cabin, go back to the cockpit, and then the lock tender would assist in getting the lines to me. (On the larger river locks that required the lock's line be used, the lock tenders usually assisted getting the lines to you, as they have to throw them down, and then bring them back up so they are not in the way of barge traffic.)
While many of the larger river locks have bollards that recreational boats can also use, the Erie Canal used mostly lines hanging from the top lock rails, or heavy lines tied at the top and bottom of the lock. Many times if the lock tender didn't mind, I would actually use the safety ladders to hang on to, as they were secure and I could actually hold the boat more secure by grabbing on to those. On the Erie, Rosanne was with me, and while in the beginning I had her picking up the back line from the cockpit and I would pick up the forward line by reaching through the front window, we finally ran into a situation where she ended up hurting herself. (Communication issue. I had told her to grab the aft line, but hang on to it as I needed to pull forward in order to reach the front line, these lines were about 30' apart and were a bit short. I did not mean for her to hang on for dear life, but she did, and received a rope burn.) After that, I ended up catching both lines myself since I frequently solo in locks. Most the lines were long enuf, so I could pick up one and then motor ahead with my kicker and cockpit helm to reach the other line. Without the cockpit helm and kicker, this would have been a bit harder and would have required assistance from the lock tender. Anyway, this is how I have worked in on first my 22, without a cockpit helm and I would have to get into position first and then run back to the cockpit, and on my 25 where I lock from the cockpit helm.
I have seen expensive fenders totally ruined by lock walls
I have ruined fender covers, but not fenders.

And I usually have the fenders right up against the lock wall. Yes, they get dirty and grimy. But rinsing them off right away helps to make cleanup a lot easier later. Yes, you'll notice my fenders are not purely white anymore. :wink:
I have to differ with Colby that once the boat is in the lock and gates secured that there is no turblance. Ask some of our members how their motor cowl ended up smacking the lock wall and badly damaged it. (I have a video of that, but have not shared it.)
I'm still not sure how he and his admiral had that happen... I mean I have seen boats that have an issue with the bow or stern twisting out away from the wall, but wonder if they let one end start moving out, without adjusting lines sooner to pull it back in. There is only one time turbulence caused me an issue. This was in the double lock on the Erie Canal. We were in it by ourselves, and parked right over the top of a valve. We were locking up. The lock tender opened it up a little bit too much, and then got busy chatting with some visitors and not paying much attention to us. We caught a large air burble and I managed to keep C-Traveler on the wall. Several minutes later we caught another larger air burble and was a bit more than I could handle. I ended up letting go of the lines rather than having the kicker hit the wall, and floated free. I tried to get it back on the wall, but no luck, so went to the other side and grabbed lines there.
There are others that have single handed through a lock, both up and down. Bill on Mystery Girl comes to mind, as I've gone through many locks with him. Yes, he uses his bow thruster sometimes to help get into position, but then has to leave his cabin helm to get back to his cockpit to grab the bollard or lines. As far as positioning on the lock wall when you first come in, it's no different than accurate docking. Then stepping back quickly to grab dock cleats.