Although not "Homemade" just thought I'd share with the forum my new PowerArm vise by Garfield Engineering (bought out by Wilton). Found this at a Flea Market in Painesville, Ohio. The vise was rusted about half way and the Hydraulics also were stuck. After making a few tools to disassemble and re-assemble, I now have a vise that swivels and rotates and also fits into my Quick Change adapter on my reloading bench. Total out-of-pocket cost for the PowerArm and rebuild was $43.00.
Here's the page from Wilton's site
Current pricing on Amazon