DS21 & DS21M / DS19A & DS19MA Repair Manual — Page 290

ASSEMBLY. 5. a) b) c) Prepare the arm body (see fig. on previous page). Check the thrust face of the four bosses for the securing screws; use a face plate 200 x 250 mm; a maximum play of 0.2 mm is permissible between the bosses and the face plate. Fit the bearings: - With a blow pipe heat the bearing housings. - Place the inner bearing cages (4) (5) (11) in their housings.