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I have a few questions that I'm hoping some of our CZCC veterans can answer: Door Panels: The parts manual shows a change made to the Door Panel Assemblies (lhs and rhs) starting in 71-10. Can anyone comment on the design change(s) made? (Note that the upper/lower Hinges are not considered to be part of the Door Panel Assemblies) Door Hinges: The parts manual shows a change made, starting in 72-07. Oddly, though, the change is noted only for the upper hinges. The lower hinges are shown as staying unchanged. This seems odd, because I believe that the design change included adding a revised travel limiter link with a detent, so that the doors would have two opening positions: fully-opened, and half-opened. The travel-limiter link, however, is part of the lower hinge. And the Nissan 'updates' document that Carl Beck posted a couple of days ago indicated that the detent feature was added to the driver's door only. Is there a mistake in the parts manual, or am I missing something? Lock Cylinders and Keys: At some point in its development, the S30's locking system switched from a 2-key set-up to a single-key arrangement (I thought this took place as part of the launch of 1972 models, but maybe it was actually when the 'early-to-late' transition happened during MY-71). In any case, it would seem that the design of the lock cylinders would have been revised as part of this change. However, the parts manuals shows no changes to the parts numbers for the door and tailgate lock cylinders over the complete span of the 240 model. The steering column lock assembly (c/w lock cylinder), on the other hand, shows a change in 70-10 (why?) and then nothing until 73-07. Can anyone explain how all of this works?

I just bought a 1976 280z 2+2 and received 2 kinds of keys from the seller. The first set is a key that has many "teeth" that works only on the ignition. The second set's "teeth" is smooth and less jagged and only works on door locks. I would prefer only 1 key for everything. Is this common?

So, working on the project 280z today, I grabbed my key and turned the lock. It immediately felt like a weird turn of the key, like the key had kind of fallen out a bit mid turn. Afterwards I realized that this key (got 6 with the car) is a bit smaller than the key I normally use. Must be an older key, or a door key or something. Oops. After the turn I was able to pull the key out easily. It goes back into the lock fully and easily too. The 'real' key doesn't really fit in the lock now, but the smaller one I used goes all the way in. Getting it to OFF though is another matter. It's stuck in ON. Cannot turn it. Had to take apart the ignition area and pull the plug to turn the car off. The previous owner luckily had not broken the anti-theft screws, so I've got the ignition lock out of the car now to work on it. How can I get this lock to turn again? Has anyone completely pulled out the tumblers before? What's the secret to getting them out of the casing?