cross brace for K70 and K6570 (7,0 x 4,5cm)

• from 60 cm lenght one slot
• from 2 m lenght two slot
• from 3 m length 3 slots
• from 4 m length 4 slots

Depending on the length, the centre pieces either have no slot at all (shorter than 60 cm length), only one slot (from 60 cm length) or 2 slots (from 2m length),  from 3 m length 3 slots,  from 4 m length 4 slots. Accordingly, further middle pieces should be added so that 2 of them interlock at each slot, forming a cross and thus stabilizing the frame. Matching slots are worked into the wedge frames to anchor the ends of the corresponding centre pieces there.