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What was known as "a lithium frame" (I do believe I restricted the comment to that) was, at that time (another concept you may have trouble working with ~ not just the logic behind grammar) a highly sought after outcome of the development of a practical aluminum-lithium alloy.

You would probably be better off looking that term up ~ no doubt your last and possibly only experience dealing with the substance was in the framework of the wheel well of the 747 where you stowed away for your trip to America.

No success finding references to "lithium frames," no.

no doubt your last and possibly only experience dealing with the substance was in the framework of the wheel well of the 747 where you stowed away for your trip to America.

Wrong again. The wheel well was my first experience with lithium-bearing aluminum alloys, not my last. I've had many subsequent opportunities to examine the stuff while stowing away on local and international flights. I've determined that they contain less then 3% lithium, often at least as much copper or zirconium as lithium, and no one calls components made of these aluminum alloys "lithium."

Now, if you'll excuse me, I have a flight to catch in an hour, if you get my meaning.