Hi! Firstly, sorry for bad English, it's not my first language :) I don't have experience in mechanical engineering so I came here to ask for help. Here is sketch of one simple construction I want to realize: Here we have 5 cm thick plate (it would be wooden), 50cm long and 35cm wide. There will be hole drilled in plate for shaft (it will be long 40cm - 50cm) . There would be some gear on shaft and DC motor to rotate shaft. My question is, how can I "fix" gear shaft to carry load without falling down? Here is one shaft I found on google http://cdn3.volusion.com/vyfsn.knvgw/v/vspfiles/photos/am-2392-2.jpg?1420269442 I don't see way how can one use it in this situation. How can one mount gear on this shaft?