I made this tool to push the pucks back in on disc brake jobs. It's easier than trying to use c-clamps, and it's dead cheap.
The center bolt is just a long bolt, but you could use all-thread. All nuts and the bolt head are 1/2".
The puck end has a double-nut on it, the other end has a bolt head that I turn with a socket wrench. You could put a particular sized washer on this end to keep the tool centered in the puck. I haven't, and it still works well.
The flange is just a heavy piece of scrap I had laying around. The center nut under the flange has a wrench on it to hold it while turning the socket wrench to tighten.
I've use it on my F250SD, my 98 Z28, Daughter's 97 Dodge Avenger, and the CRX.