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veLLo
I quickly modeled it in Solidworks and ran some simulations:
http://imgur.com/a/I37y4
Displacement is virtually identical between the stem with and without hole, which seems to indicate it doesn't make too much of a difference. Keep in mind this is a rough model and more importantly I'm a designer who happens to know Solidworks and not an engineer. Someone with actual knowledge about this should probably chime in. @mdcc_tester perhaps?