10 has been pressed down by force f thus the push pins 9 have pushed down the lock pins 7 compressing the springs 8 and placing the lock pins 7 in the unlocked position ready to be rotate fig3 c shows the same cross section through outside tube 2 but with inside tube 1 rotated slightly this is possible because tubes 1 and 2 are unlocked from one another the springs 8 are still biasing the lock pins 7 but the tops of pins 7 abut the bottom surface of quill disc 4 which provides the balancing force to the spring 8 bias fig4 is an alternative embodiment of the present invention wherein the stem is integral with the quill outside tube 2 has attached thereto or formed integrally therewith a stem body 15 the stem body 15 includes a number of threaded holes 16 in which bolts 17 are screwed holding the stem 100 together adjustable extension 18 and handlebar holder 19 are part of the stem 100 the handlebar 20 is firmly held between the adjustable extension 18 and the handle bar holder 19 handlebar 20 is removable and adjustable by means of bolts 17 fig5 shows the same stem as fig4 in which an additional extension 21 has been placed in order to elongate the stem 100 i e increase the distance between outside tube 2 and handlebar 20 fig6 is the same as fig5 but with two additional extensions 21 instead of one showing that is possible to.