Never done a delaval pump but I do gast vane pumps monthly. A couple things I can recomend. Do it right once and i will last you many years. Get a cylinder honing tool from an auto store that goes on your drill. Hone out the cylindre wall lightly to get the glazing of the walls. If you see any mild scoring on the cylinder hone it till its gone. This will help make for better vac transfer and aid in the longevity of your vanes. Flush the cylinder out well to get her clean and all particles out of the system. I would also replace your bearings regardless if they feel good or not. You have it apart now why go back after one season and do it then when they fail. Inspect the vanes and if there is mild scoring on them a fine peice of sand paper on a flat surface and lightly smooth them out. If they are pretty worn down or have excessive grooving from the contact of the slot they fit in replace them. They are not cheap. Slap it all together and let her run for an hour under no load to let the vanes settle back in nicely. Give her a nice shiny new paint job and enjoy your pump.
2X6 deluxe Phanuef
Adding 200 more every year
27 years left of building a Hobby into a retirement time burner.