Most chin up bars sold for home use will have three
components:
one piece extendable bar with rubber suction on each end - ( the
bar can be turned in any one direction to extend or shorten its
length to fit any door way).
two end caps - each with at least 3 holes
one set of screws.
Both the end caps must be screwed into the doorway, after the
preferred height level is determined, and that both are at the same
height.
These two end caps will be where the end suction rubber of the
extendable bar will be "held" in place.
Without these two end caps, the suction rubber may slip, when one's
full body weight is taken up by the chin up bar, and causing the
bar and one's body to crash by the gravity pull.
It will be painful when your knee or your toes crashed onto the
floor, when the chin up bar slipped from its position without the
end caps acting as an "anchor or holder cup".
If you are taller then the height of the doorway allow for the chin
up bar to be installed, you can always curl up your leg (by either
adopting a kneeling position while hanging in the air, or taking on
a knee up position when hanging), then pulling your entire body
weight up.
Try getting one at Mustafa, they sell two varieties (below or above
S$20.00), and both with end cups to be screwed into the door jamb,
or onto the wall of a narrow passage way.
