Hi, I am new to the group. I have a major problem which I hope someone may have a solution for. I own a 1992 Fiat Ducato motorhome. The braking system is very weak due to the vacuum pump not operating. It attaches to the side of the engine and connects directly to the camshaft. It appears that there should be a keyway that fits between the pump and the camshaft to make the pump rotate. This is missing! All the dealers I've checked do not have one. Does anyone have any ideas on this - or even better and actual keyway for sale? All the best, HotBlue.