Whistle with Solidworks 2014 source

This is a VERY loud, and shrill, whistle that I have included the Solidworks 2014 source as well.
Try the one without the pea (or print with the pea and separate it once done printing) and get ready to go deaf.
The one I printed, in the picture, is without the Lanyard hook and if you use the source you will see where to remove it if you want one like that as well.
The walls are 1mm thick so this is a very light whistle (which is exactly what I wanted) and the pea still was easily detached from the wall.
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Per a request I received a .STEP file has been added.