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XPat9, that's telling. Shame. If the derailleur is defective, they should replace it or at least get you in contact with someone from Microshift to replace it.
If you have to buy it yourself, just look at the specs for the Microshift derailleur in question and buy a Shimano or SRAM replacement at about the same level.
My Microshift front derailleur has been very good, very smooth.