'68 Riviera Question about this piece of the headlight vacuum system. Below is the part that hides next to the battery, and diverts vacuum to either up or down for the headlights. Smaller hose obviously comes from the headlight switch, and pulls diaphragm to direct vacuum to either side of the headlight actuators. This side of the manifold works fine and holds vacuum. My question is regarding the other side of the manifold. The large, round center port has continuous vacuum to it, via the vacuum canister (I presume). The other two oval ports go to the headlight actuators - up or down side(s). So with vacuum (using my mouth on the larger hose, as connected in pic) is applied, vacuum goes directly out one of the oval holes, and to the other oval hole when vacuum is applied to the diaphragm side. But I have a very slight vacuum leak, both in each opposite oval port and out the seal end of the internal shaft (on the very end, much like the piston in a brake master cylinder). Is this normal, or should I go looking for another complete manifold? It's only a very little leakage, but I don't know how much is too much.