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This is some of the best I've found for tapping aluminum http://www.tapmagic.com/

That would work .The next size larger would be 18mm from the normal 14.Problem being most 18 mm are a lot longer in thread plus overall length .Kind of like stuffing 5 pounds of potatoes in a 2 pound sack .

I think the difference being a heli-coil is basically just a spring while the time-sert is an actual insert .

For some reason Tom has had problems with his 441's blowing the plug loose .Fact I looked at them and the plug isn't wibbley wobbley .I have no idea why they blow out .