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Need information for a Friend!!

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Been away for awhile.
A good friend called me tonight thinking I might have an answer for an Archery problem he has.
He purchased a Bear Pursuit bow. (I have never heard of this model and could not find anything on the Bear website about this model.)
The string was worn and he replaced it. He said the tiller on the top limb was quite different from the bottom. He said this was a single cam bow. Shouldn't the specs be the same on both limbs?