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1878 Morgan 7/8-TF Weak vs Strong Question

A couple of new (to me) PCGS designations for the 1878 7/8-TF Morgan Dollar are Weak and Strong. Multiple reference books seem to agree, three or less additional tail-feather ends appearing beyond the seven (main) tail-feather ends are “Weak”, while four or more are “Strong”.
There is a wide range of sizes possible for tail-feather ends that can appear just beyond the ends of the main group of seven-feathers. We see everything from almost complete, rounded ends, to tiny remnants. Some are hardly more than a speck of raised metal representing only a small fraction of a “Ghost” tail-feather end.
I would like to know if size matters when counting the remnants of the original, underlying, tail-feather ends. And if size is not specified for the designation I.e. it is subjective, is there a rule of thumb for what might or might not qualify as a tail-feather end?

Any help with this will be greatly appreciated,
Steve
golfpkg
I love the Jefferson Nickel Series! Mint State and Proof. Will buy, sell, trade, low pop PCGS Jeff's.
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The feather tips are really only part of what is doubled in these coins. I’ve had some “weak” pieces that had doubled claws, doubled legs and a lot of neat stuff. BUT the feathers are what counts. The other doubling is great for those who appreciate it.
This weak/strong thing still has me Baffled! I think it's because when an 8 TF hub got reworked to be a 7 TF hub the intention was that no feathers would show from the 8 TF design. So, any that do show and even remnants that show are errors. It would be good to look at a dozen each, weak and strong, in PCGS holders.
Thanks again,
Steve
Bill Jones, it's interesting to note that of all the 7/8 models only 4 are on the Top 100 vam list and of those only 1 is because of tailfeathers.
Vam 32. 2nd rarest 7/8, only shows 3TF but is a high $$ coin.
Vam 44. Tripled rev-"The Big One", King of VAMs
Vam 45. Third rarest 7/8, doubled legs.
And VAM 41, which shows 7 extra TF.
Arrrrrggggg!
It's all about the $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$.
There is a 7/8tf attribution guide that lists all the known "doubled tailfeather varieties," with pics and descriptions. FYI, all 7/8 varieties will have a long nock, AND, there are a couple 7/8tf varieties that have zero extra feathers showing.
It is the fact that the B1 hub (7tf, PAF w/long nock) was impressed over the A hub (8tf); some have extra feathers and some have extensive doubling, but all have the long nock.
Anyway, the book is:
The 1878 Morgan Dollar 7/8TF Attribution Guide, by Jeff Oxman and Les Hartnett. It also includes the 7TF B1 varieties.