MTH #23796 Saw Mill

Is there a way to wire the saw mill so it is an on/off operation instead of having to keep the button depressed? My grandkids struggle with it when they have to hold down the button.

JohnHenry

An SPST switch?

http://www.radioshack.com/product/index.jsp?productId=2062494&filterName=Type&filterValue=SPST

thank you