Installed 4 angles 6-B-5-53 on backrest, after deburr and primer. Installation of rudder cables, 6-B-23-51, left and right. Rivet the plastic plates to central longeron, 2 plates at rear longeron and 2 plates through skin at rear sides. Those openings had to be enlarged somewhat. Adjustable section of cables are in forward end. Continue with elevator cables, 6-B-24-50 and -24-51. Plastic plates attached to central channel, but holes in 6-B-12-1 frame seems to be in wrong position. Have to confirme.