Same pump, same approach.

I do clean the bolt with brake cleaner, let it dry, then put on the loctite blue. Maybe I should switch to red for the peace of mind. When the bolt threaded out, it tore the washers to pieces and knocked a hole in the cap. Good thing I bought a used vacuum pump for $40 off ebay and had it laying around.

I also use the bolts, as you did, to make sure the diaphram lines up with the holes so you can install the cap.

Maybe what has happened is just a freak thing. This is one of the weak links in the car, so maybe I am over-reacting. At least now I have replacement down to a science. I just wish that a failure didn't result in a suprise loss of power breaks and a big pool of oil under the car.

Jim