[KenWittlief]

I have to add - GUARD your drill motor gear boxes from the general student population on your team

Several times I have watched a student pick one up, say "hey whats this thing?" handle it like any person would lookin at something new and strange

and within seconds, the transmission is open and the gears are all over the:

A. table
B. floor
C. student
D. all of the above

and they only go back together one way (not obvious)

denfinately let students look at them if they want to - but first make sure you know how to put one back together -second issue the warning "be carefull - it comes apart really easily!"