On both the Thoro-Graph and Ragozin scales ... 2 pounds at 10 furlongs equals 4/5ths or 80% of one length.
From the study Beyer did on weight - published in Beyer on Speed - I believe a pound is equal to 4/10ths of one Beyer Point. So, two pounds at 10fs, would equal 80% of one Beyer point - or about a margin of a Neck.
So, basically, if you believe Thoro-Graph and Ragozin - the 2lbs was worth 8/10ths of a length.
If you believe Beyer, it was worth about a neck.
I have seen differences of opinion on the subject in the Euro material as well - but weight is viewed with more importance there - and I believe most of the material I've seen has the spread even a little wider than Thoro-Graph and Ragozin have it.
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