Or Just Pull the Right Magneto
Iíve replaced quite a few vacuum pumps and after struggling with crowfoot wrenches, ratcheting box wrenches, chisels, shovels, chainsaws, etc., a co-worker told me to cut my losses and just remove the right magneto.
After that, changing the vacuum pump is dead easy, and reinstalling the magneto only takes 15 minutes or so. Cheaper than buying the special wrench, too.
I replaced our right magneto with a Lightspeed Plasma III ignition system and that fixed that. As soon as The Crew Chief (wife!) approves it, weíll redo the instrument panel and sell that vacuum dinosaur thingy.