For the early oversize Balances:
Can anyone direct me to an online description and illustration comparing long threaded sections with short smooth sections? I want to understand the mating surface between the barrel and section of the long threaded section. See photos below.
TIA
Edited to greatly simplify. (Ignore the title of this thread which it's too late to change, since it turns out Sheaffer made no such evolution.)
Short smooth section on threaded barrel:
IMG_2683.jpg
Long threaded section on smooth barrel:
IMG_6904.jpg
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