semi circular bars 23 are used this provides rounded ends but also increases the space separation between the long bars as evident from the pins 30 34 in particular the pin that is aligned to be inserted but not yet inserted into the bars the shanks are stepped to provide a smaller diameter and that is receivable within the aligned holes 46 a 46 b while the upper portions of the shank are of larger diameter other configurations can be created as suggested in fig6 in which one u shaped bar 22 is shown in the process of being assembled with two l shaped bars 20 as will be more evident in connection with fig7 a 7 b the tabs or tenons t are preferably tapered as shown and the channels or mortises m are similarly tapered to facilitate insertion and assembly of the looms locking pegs are inserted into the aligned holes 46 a 46 b after the bars have been mated and fully inserted into abutting relationship against each other the remaining non locking pegs or pins can be inserted either prior or subsequent to assembly of the frame into the desired geometrical configuration some additional details of the described bars will now be discussed in relation to fig7 a 12 f in fig7 a 7 b the l shaped bar 20 is shown to have two legs 20 a 20 b normal to each other and a top surface s the leg 20 a has an end surface 20 f while the leg 20 b has an end surface 20 g the tab t projects beyond the end surface 20 f an optional cutout 48 as.