I'll bet whatever is in my pocket that the crack has been there since the day that part was made. The folks on here that have expressed frustration with trim tab construction are no doubt talking about the bends that are required to close off the ends. When I tried to make mine, a crack formed exactly where yours is cracked. It was VERY small, but there. At this point, I trimmed the ends off the tab (along with the crack) and made tiny little end ribs, as many before me have done. I'm not sure if this is an option for you, but it might be worth considering.
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Steve Zicree
Fullerton, Ca. w/beautiful 2.5 year old son 
RV-4 99% built  and sold 
Rag and tube project well under way
paid =VAF= dues through June 2013
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