First draft of Minecraft piston block with lever function to open and close 

assembly guide in pictures below 

Firstly glue your white blocks to the main piston block so we can begin the assembly.

• Assemble outlined cover to stone block

• Put piston into the stone block

• Fit the lever into the hole above and match the holes with the holes of the piston 

• I left some wiggle room in order to fit the assembly of the pin
• When you have successfully fit it through the holes, secure it with the pin cover.

• Place the stone block cover and add glue to secure its place 

• Finally add the outline cover to match the outline block and secure with some glue 

And you are finished !! 

Any comments for improvement are welcome.