over a rung 3 positioned between the upright supports 4 on a conventional ladder as shown in fig4 the standoff has a second u shaped support 15 which slides over a lower rung on the ladder this will attach the standoff 1 to the rungs of a ladder the fit between the u shaped supports 2 15 should be snug so they cannot rotate with respect to the rungs of the ladder a brace 16 is attached between the support 15 and the arm 9 in any conventional manner to provide stability between the support 15 and the arm 9 as shown in fig1 a pair of arms 5 are connected at one end to the support 2 in any conventional manner the arms 5 are connected at the other end at 13 to a second pair of arms 10 the arms 10 are pivotally connected at 7 to a center arm 6 8 see fig2 the arms 10 have a series of keyhole slots 11 12 extending along the length of the arms 10 each of the arms 5 have a headed pin 13 which can be moved along the series of keyhole slots compare fig1 and 3 by moving the pin 13 into different portions of the series of keyhole slots 11 12 the arms 10 can.