Knex Universal joint

Semi strong Universal joint compatible with Knex, it will get worn down and somtimes develop a squeak sound when under high stress from a rc motor. You will need a Soldering iron or somthing to melt/weld the plastic together to assemble the universal joint and MAKE SURE to print the U joint arms horizontal to have the most strength and just leave the other two pices as they are in the file. the Cross piece is for a knex rod that has its end cut off so you can slip it on