Not familiar with that Harrington/Harnell. The 3 Harnels I have are a 542, which is a 10' parabolic blank, the 540, an 8-1/2' meat blank, and my dad's ancient 552 which you can pole vault with.
The 542 is really no heavier than a Lami 121 3M in your hands. It might weigh an ounce or two more on the blank, but finished and with a reel on it, the difference is negligible.
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