The easiest would be to create the centre hole (the one on the axis) then do 2 patterns, 1 up (anti-clockwise) and one down (clockwise)
You don't have an absolute position for the hole but I would assume that the top edge is tangent to the 69 height ring.
Insert a plane on this face. Insert a plane tangent to the piston on the side the holes are.
Use these 2 planes to create an axis.
Use axis and tangent face to insert a plane at 25°.
Sketch a 2mm circle or use the hole tool and position the hole tangent to the corner and extrude.
Pattern the extrusion 5 times at 12.5°
Pattern again 5 times the other way.
See attached V26 quick and dirty model which shows the procedure.
You could also create an offset tangent plane at 50° to get the first hole and then pattern 9 in the correct way.