The Army's technical manual TM 11-2352 describes maintenance for the Pacemaker and Anniversary models. Pertinent instructions are:
(8) With a screw driver, obtain trension on lower roller by winding the roller counter5clockwiswe. Hold the roller and pull the curtain out by hand several times to remove roller slack; then slowly release the spring tension.
(9) Position retainer O-20 over the shaft and start screw H-48. Draw a pencil line on the retainer, and using this as an index, wind the roller six revolutions counterclockwise. Tighten screw H-48 so the screw shoulder fits in a cut-out of retainer O-20
(17) To check focal plane shutter speeds:
(a) set the shutter at the O aperture; with the camera either horizontal or vertical, the shutter opening should move slowly and smoothly across the camera. The curtain should latch in position with the shutter release depressed. The winding key should lock and should not rotate.
(b) If the curtain movement is not smooth and even, and if the curtain does not latch when the movement is completed, the tension on lower roller O-26 must be increases as described in (8) above The tension should be added and checked by half turns above the six turns prescribed."
The manual also says, Caution: Use only recommended lubricants on this shutter." The correct lube for the shutter (in 1950) was P-38 (Sig C stock No. 6G1398.7). I'd use any light oil (but never never WD-40). I put a bit of oil on a tiny screwdriver or toothpick and apply it to the bearings without removing the shutter rollers.